Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Mixing of two or more solid polymers; mixing of solid...
Patent
1990-07-06
1993-03-23
Marquis, Melvyn I.
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Mixing of two or more solid polymers; mixing of solid...
525309, C08F26504
Patent
active
051964830
ABSTRACT:
Modified rubber compositions comprise by weight about 15-60% of a highly saturated aliphatic rubber such as ethylene-propylene-diene rubber, about 25-80% of acrylate monomer units; and less than about 5% multi-functional monomer units. The compositions exist as amorphous heterogeneously dispersed phases. The first phase comprises the copolymer rubber to which polymers of at least 10% of the other monomer units are grafted. The second phase comprises the other monomers polymerized as homo and copolymers, not grafted to the rubber. Optionally, up to 20% of the composition comprises high index monomer units. The high index monomer units may be copolymerized with the acrylate and grafted to the rubber. Greater than 10% of the monomer units other than rubber are grafted to the rubber. The number average molecular weight of the grafts is between 10,000 and 80,000 daltons. About 2-20% by weight of one or more polymers may be provided to adjust the refractive indices of the rubber or the polyacrylate phase in the final product such that when the composition is present at the 10% rubber level, the haze can be reduced to less than 20%.
REFERENCES:
patent: 4316971 (1982-02-01), Rim et al.
patent: 4490507 (1984-12-01), Abe et al.
patent: 4598123 (1986-07-01), Cutter
Japanese Abstract, JA-7202191-R, Jan. 1972.
Japanese Abstract, J54137-041, Oct. 1979.
Chemical Abstracts, vol. 84, No. 6, Feb. 1976, Reporting Japanese Kokai, 75, 111,138, apparently published, Sep. 1, 1975.
Binder Sidney
Card Roger J.
Milks John
Siol Werner
Wunderlich Winfried
American Cyanamid Company
Dean Karen A.
Marquis Melvyn I.
Van Riet Frank M.
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