Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Mixing of two or more solid polymers; mixing of solid...
Patent
1982-09-30
1986-12-09
Lieberman, Allan M.
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Mixing of two or more solid polymers; mixing of solid...
525 64, 525 66, 525 67, 525 68, 525 84, 525 95, 525 96, 525 98, C08L 5100, C08L 5300, C08L 5302
Patent
active
046280723
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The present invention relates to a modified block copolymer composition comprising a thermoplastic polymer and a modified block copolymer.
More particularly, the present invention relates to a resinous modified block copolymer composition excellent in impact resistance, adhesion, paint adhesion, weatherability, resistance to heat aging, transparency and gloss and also to a rubbery or leather-like modified block copolymer composition excellent in heat resistance, abrasion resistance, compression set resistance, adhesion, transparency, oil resistance, weatherability and resistance to heat aging. Each of the above-mentioned compositions comprises a thermoplastic polymer and a modified block copolymer comprising a base block copolymer of a monovinyl substituted aromatic hydrocarbon polymer block and an olefin compound polymer block having an ethylenic unsaturation degree not exceeding 20%, the base block copolymer having a molecular unit containing a carboxylic acid group and/or a group derived therefrom grafted thereonto.
DESCRIPTION OF THE PRIOR ART
Recently, thermoplastic resins such as polyamides, thermoplastic polyesters, thermoplastic polyurethanes, polyoxymethylene resins, polycarbonates resins, polysulfone resins, nitrile resins, polyphenylene ether resins and polyarylene sulfide resins have been widely used for mechanical parts and electrical parts for which excellent mechanical characteristics, high heat resistance and good durability are required. Weight reduction of the body of an automobile has been promoted to decrease fuel expenses to one of the energy-saving measures, and thermoplastic resins have attracted attention as light-weight materials for automobile parts which have excellent mechanical characteristics and durability.
However, these thermoplastic resins have some defects and fail to sufficiently satisfy requirements demanded in their application fields.
For example, polyoxymethylene resins and nitrile resins are advantageous in that they have very high tensile strength, flexural strength and flexural modulus, they can provide very tough molded articles and they are excellent in solvent resistance, but these resins are inferior in paint adhesion and they cannot advantageously be used as automotive exterior and interior trims or as exterior decorative materials of household electrical appliances. Polycarbonates resins have a very high mechanical strength and their impact strength is very high, but these resins are defective in that the paint adhesion is relatively poor. Furthermore, polyamides, thermoplastic polyesters, polysulfone resins, polyphenylene ether resins and polyarylene sulfide resins have a good heat resistance and a high mechanical strength, but they are defective in that the impact resistance is poor.
Block copolymers comprising a monovinyl substituted aromatic hydrocarbon and a conjugated diene compound, especially styrene-butadiene block copolymers, are polymeric materials which have recently attracted attentions.
Characteristic properties of these block copolymers differ according to the content of the monovinyl substituted aromatic hydrocarbon. More specifically, a block copolymer having a relatively low content of the monovinyl substituted aromatic hydrocarbon, even though it is unvulcanized, has a good elasticity at room temperature and shows rubbery characteristics. On the other hand, a block copolymer having a relatively high content of the monovinyl substituted aromatic hydrocarbon is excellent in transparency and impact resistance and shows resinous characteristics. Moreover, a block copolymer comprising a monovinyl substituted aromatic hydrocarbon and a conjugate diene compound shows at high temperatures flow characteristics similar to those of a thermoplastic resin, and this block copolymer is advantageous in that the block copolymer can easily be molded by an ordinary extruder or injection molding machine. However, the above-mentioned block copolymers are fatally defective in that the weatherability and resistance to thermal deteriora
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Hayano Fusakazu
Morita Hideo
Shiraki Toshinori
Asahi Kasei Kogyo Kabushiki Kaisha
Lieberman Allan M.
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