JP2002101492

Patent Translate
Powered by EPO and Google
Notice
This translation is machine-generated. It cannot be guaranteed that it is intelligible, accurate,
complete, reliable or fit for specific purposes. Critical decisions, such as commercially relevant or
financial decisions, should not be based on machine-translation output.
DESCRIPTION JP2002101492
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
foam sheet material for a speaker edge and a method for producing the same, and more
particularly to a foam sheet material for a speaker edge for automobiles requiring heat
resistance.
[0002]
[Prior Art and Problem to be Solved] Although urethane foam sheet and vulcanized foam rubber
sheet are generally used as the material of the foam sheet for the speaker edge, any materials are
also harmful at the time of waste combustion treatment. There are environmental problems such
as generation of gas and difficulty in recycling. Furthermore, in terms of durability, the foamed
urethane sheet has poor resistance to hydrolysis, and the vulcanized foamed rubber is heavy and
has disadvantages such as oxidative deterioration after molding and inferior design. Therefore,
there is a need for a sheet for a foam speaker edge that is light in weight, is resistant to
deterioration by oxidation after being molded, and is recyclable, without deterioration in
durability due to hydrolysis.
[0003]
[Means for Solving the Problems] As a result of intensive studies to solve the above-mentioned
problems, the present inventors have found that foams comprising a specific thermoplastic
polymer composition are acoustic, recyclable and flexible. The inventors have found that the
11-05-2019
1
hydrolysis resistance, the resistance to oxidative deterioration after molding, the light weight, the
heat resistance, the moldability, the designability, and the appearance of the molded product are
excellent, and the present invention has been completed.
[0004]
That is, according to the present invention, a styrenic thermoplastic polymer composition (a
block comprising a vinyl aromatic monomer and at least one conjugated diene compound) having
a hardness of 0 to 60 Shore A (Shore A) is used. A hydrogenated block copolymer consisting of a
polymer block mainly composed of 50 to 150,000 in number average molecular weight, for
example, Kuraray Co., Ltd., trade name: Septon 4033, 4055), Shore A hardness 0 to 0 When the
foam sheet of the olefin thermoplastic polymer composition which is 60 is used for the speaker
edge, the acoustic property (for example, reverberation effect), recyclability, flexibility, hydrolysis
resistance, acid resistance after molding It is found that the balance of deterioration resistance,
lightness, heat resistance, molding processability, designability, appearance of molded products,
etc. is excellent. The improvement of the properties of Ejji is has been reached.
[0005]
Incidentally, even if other thermoplastic polymers, antioxidants, UV absorbers, lubricants,
pigments, foaming agents, fillers, etc. are added to the thermoplastic polymer composition
constituting (I) Good.
[0006]
The respective components will be described: (I) of the present invention comprises a styrenebased thermoplastic polymer composition having a Shore A hardness of 0 to 60 and a foam of an
olefin-based thermoplastic polymer composition.
And when the sheet ¦ seat which consists of a thermoplastic polymer composition whose Shore A
hardness is larger than 60 is used, the target softness ¦ flexibility will not be satisfied.
[0007]
Known styrenic thermoplastic polymer compositions used in (I) of the present invention may be
known ones, but they are mainly composed of a block composed of a vinyl aromatic monomer
and a conjugated diene compound. Consisting of 50 to 150 parts by weight of a softener for
rubber and 0 to 50 parts by weight of a polyolefin resin based on 100 parts by weight of a block
11-05-2019
2
copolymer hydrogenated product having a number average molecular weight of 5,000 to 15,000
and composed of a polymer block When the melt flow rate at 230 ° C. and a load of 2.16 kg is 5
g / 10 min or more, in particular, the acoustic properties (eg, reverberation effect), recyclability,
flexibility, hydrolysis resistance, A sheet with excellent balance of oxidation degradation
resistance after molding, lightness, heat resistance, molding processability, designability,
appearance of other molded products, etc., and excellent in calendar processability and
foamability It is preferable because the
[0008]
The olefinic thermoplastic polymer composition used for the above-mentioned foam includes
polyethylene (high density polyethylene, low density polyethylene, linear polyethylene),
polypropylene, ethylene-propylene (random) copolymer. Combined, ethylene-butene (random)
copolymer, ethylene-methyl methacrylate copolymer, ethylene-ethyl acrylate copolymer, ethylene
vinyl acetate copolymer, ethylene-vinyl alcohol copolymer, ethylene ionomer resin And
thermoplastic olefin elastomers (hard component: polypropylene, soft component: ethylene /
propylene rubber, etc.).
Furthermore, the third component may be added to diversify the constituent components.
[0009]
If the expansion ratio is less than 1.2 times, problems occur in acoustic characteristics and
lightness, and if it exceeds 2.5 times, problems in strength occur.
[0010]
Description of Method for Producing Sheet After the resin composition according to the claim is
kneaded with a Banbury mixer, a two roll worm-up roll, etc., the above-mentioned support in a
calendar such as an inverted L-shaped four-roll calender etc. It is laminated on one side of the
body sheet.
Subsequently, application of the surface treatment agent, heating and foaming, embossing, and
surface treatment are sequentially performed.
11-05-2019
3
Thereafter, the foam layer is sliced in parallel with the support sheet or obtained by a method of
peeling the support sheet.
As the above-mentioned support sheet, paper, cloth, non-woven fabric and the like can be used.
[0011]
According to the present invention, there is obtained a foam speaker edge which is light in
weight and recyclable without deterioration in durability due to hydrolysis. The speaker edge
using this elastomer foam sheet is excellent in the weight reduction and the external vibration
absorption which are effective in acoustics. Furthermore, there are other problems with the prior
art, which is excellent in balance of recyclability, flexibility, hydrolysis resistance, resistance to
oxidative degradation after molding, heat resistance, molding processability, designability, and
appearance of molded products. I can solve everything.
[0012]
BEST MODE FOR CARRYING OUT THE INVENTION Example 1 The resin blend (1) having the
composition shown in Table 1 below is kneaded for 5 minutes with a Banbury mixer, followed by
6 minutes with a two-roll warm-up roll. After kneading, the above composition was adhered to
the lower surface of the support sheet subjected to the undercoating process of the ester taffeta
to a thickness of 0.4 mm by means of an inverted L-shaped four-roll calender.
[0013]
Table 1 (Compound (1)) Hydrogenated product of styrene-conjugated diene block copolymer
(manufactured by Kuraray Co., Ltd., trade name: Septon 4033) 30 parts by weight (manufactured
by Kuraray Co., Ltd., trade name: Septon 4055) Part paraffin oil (made by Idemitsu Petrochemical
Co., Ltd. trade name: PW380) 40 parts by weight Polypropylene (made by Japan Polyolefin Co.,
Ltd. trade name: PH943B) 20 parts by weight Foaming agent (made by Otsuka Chemical Co., Ltd.
trade name: AZ-H) 5 parts by weight phenolic Antioxidant (manufactured by Asahi Denka Kogyo
Co., Ltd. trade name: AO-60) 0.1 parts by weight Phosphite-based antioxidant (trade name: PEP36 manufactured by Asahi Denka Kogyo Co., Ltd.) 0.1 parts by weight Made by Electrification
Industry Co., Ltd. Brand name LS-5) 0.3 parts by weight Pigment (made by Toyo Ink Mfg. Co., Ltd.
trade name TE color) 3 parts by weight
11-05-2019
4
[0014]
The laminated sheet obtained above was foamed by passing it through a foaming furnace at a
temperature of 210 ° C. for 2 minutes to obtain a foamed laminated sheet having a total
thickness of 0.8 mm.
Then, the resin layer surface of the foamed laminated sheet was embossed at a temperature of
150 ° C. to flatten the surface.
Subsequently, the support was peeled off to obtain a foamed sheet of Example 1 of 0.8 mm. This
sheet-like material was excellent in balance of acoustic property, recyclability, flexibility,
hydrolysis resistance, oxidation degradation resistance after molding, light weight, heat
resistance, molding processability, designability, appearance of other molded articles, etc. .
[0015]
Example 2 The resin blend (1) having the composition shown in Table 1 above is kneaded for 5
minutes with a Banbury mixer, followed by kneading for 6 minutes with a two-roll warm-up roll,
and then reverse L The above-mentioned composition was stuck to a thickness of 0.4 mm on the
lower surface of a support sheet subjected to a subtractive process of an ester taffeta by means
of a figure 4 roll calendar.
[0016]
A primer (trade name Unistol "P-801" manufactured by Mitsui Petrochemicals Co., Ltd.) was
applied to the surface of the laminated sheet obtained above using a gravure coater (120 lines /
square inch) (dry coverage 2.5 g /). m2), dried, and then a mixture of a urethane-based surface
treatment agent (100 parts by weight of "CRISVON 3354" manufactured by Dainippon Ink &
Chemicals, Inc. and 5 parts by weight of pigment) was applied (dry coverage 2.5 g / m 2) and
dried.
Thereafter, the laminate sheet was passed through a foaming furnace at a temperature of 210 °
C. for 2 minutes to foam the composition (1) to obtain a foamed laminate sheet having a total
thickness of 0.85 mm.
11-05-2019
5
[0017]
Then, the resin layer surface of the foamed laminate sheet is embossed at a temperature of 150
° C. to flatten it, and further, a urethane type surface treatment agent (made by Dainippon Ink
and Chemicals, Inc., trade name CRISVON 3354 and 100 parts by weight A mixture of 5
parts by weight of matting agent (Dainippon Ink and Chemicals, trade name "HAULAC MAT A1008" is applied (dry coverage 2.5 g / m 2), dried and subsequently peeled off from the support,
0.8 mm The foamed sheet of Example 2 was obtained. As in Example 1, this sheet-like material
has acoustic properties, recyclability, flexibility, hydrolysis resistance, resistance to oxidative
degradation after molding, light weight, heat resistance, molding processability, designability,
appearance of molded articles, etc. It was excellent in balance.
[0018]
Table 2 below compares the foam of the present invention obtained in Examples 1 and 2 with a
conventional urethane foam (denoted as urethane) and a vulcanized rubber foam (denoted as
vulcanized rubber). Show the results. Example 1 Example 2 Urethane-vulcanized rubber acoustic
property ◎ × ○ Recyclability ◎ × × Flexibility ◎ 加 水 加 水 加 水 Hydrolysis resistance ◎ ◎
◎ Oxidation resistance after molding ◎ ○ 酸化 軽 量 Lightness ◎ △ × 耐熱 heat resistance ◎
○ 加工 molding processability ◎ × 意匠 designability ◎ × x molding appearance ◎ ○ ○ ○
11-05-2019
6