Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Mixing of two or more solid polymers; mixing of solid...
Patent
1978-11-27
1979-11-06
Michl, Paul R.
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Mixing of two or more solid polymers; mixing of solid...
428519, 525 78, 525 84, 525 85, C08F27902
Patent
active
041736001
ABSTRACT:
A multi-stage sequentially produced polymer structure composition, comprising: an innermost layer (A), and successively seed polymerized thereupon an elastic polymer layer (B), an outermost layer (C) and at least one intermediate layer (D), said layer (A) which has a glass transition temperature (Tg) of at least 10.degree. C. and which constitutes 5-35% by weight of the total polymer composition being the polymerized product of a monomer mixture comprising 51-100 parts by weight of styrene or a styrene derivative, 0-49 parts by weight of a monomer having a copolymerizable double bond, 0-10 parts by weight of a polyfunctional monomer, and 0-5 parts by weight of a graft crosslinking agent; said layer (B) which has a glass transition temperature of 0.degree. C. or less and which constitutes 5-55% by weight of the total polymer composition being the product, polymerized in the presence of a product containing the previously polymerized stages, of a monomer mixture comprising 60-100 parts by weight of a diene monomer, 0-40 parts by weight of a monomer having a copolymerizable double bond, 0-10 parts by weight of a polyfunctional monomer and 0-5 parts by weight of a graft crosslinking agent; said layer (C) which has a glass transition temperature of at least 50.degree. C. and which constitutes 10-70% by weight of the total polymer composition being the product, polymerized in the presence of a product containing the previously polymerized stages, of a monomer mixture comprising 51-100 parts by weight of styrene or a styrene derivative and 0-49 parts by weight of a monomer having a copolymerizable double bond; and said intermediate layer (D) which constitutes 5-45% by weight of the total polymer composition being the product, polymerized in the presence of a product containing the previously polymerized stages, of a monomer mixture comprising 20 to (Y-10) parts by weight of styrene or a styrene derivative, (Y-10) to 20 parts by weight of a diene monomer, 0-10 parts by weight of a polyfunctional monomer and 0-5 parts by weight of a graft crosslinking agent, wherein Y is the amount of diene monomer used in the formation of said layer (B).
REFERENCES:
patent: 3793402 (1974-02-01), Owens
Hasegawa Akira
Kishida Kazuo
Mohri Hiroshi
Michl Paul R.
Mitsubishi Rayon Co., Limited
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