Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Mixing of two or more solid polymers; mixing of solid...
Patent
1982-06-01
1985-06-04
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...
525301, 525305, 525306, 525902, C08F26506
Patent
active
045215685
ABSTRACT:
A sequentially produced multilayer acrylic thermoplastic resin composition is provided, which has (A) a hard first stage layer having a glass transition temperature (Tg) of at least 25.degree. C., polymerized from methyl methacrylate alone or a monomer mixture predominantly comprising methyl methacrylate by emulsion polymerization; (B) a soft second stage layer, polymerized in the presence of the hard first stage layer from a monomer mixture comprising (B-1) a predominant proportion of an alkyl acrylate, (B-2) a minor proportion of a monoethylenically unsaturated monomer and/or a polyfunctional crosslinking monomer, and (B-3) a minor proportion of a polyfunctional graftlinking monomer by emulsion polymerization; said second stage layer exhibiting a Tg of not higher than 25.degree. C. if the monomer mixture is polymerized in the absence of the first stage layer; and (C) a hard third stage layer, polymerized in the presence of the second stage layer and the first stage layer from methyl methacrylate alone or a monomer mixture predominantly comprising methyl methacrylate; said third stage layer exhibiting a Tg of at least 25.degree. C. if the monomer charge is polymerized in the absence of the second stage layer and the first stage layer, and the third stage layer having decreasing molecular weights from the innermost portion to the outermost portion. The acrylic resin exhibits enhanced impact-, solvent- and stress-whitening resistance.
REFERENCES:
patent: 3661994 (1972-05-01), Hwa et al.
patent: 3787522 (1974-01-01), Dickie
patent: 3793402 (1974-02-01), Owens
patent: 4052525 (1977-10-01), Ide et al.
patent: 4289823 (1981-09-01), Arkens
Hirano Hiroyuki
Mori Kyoichiro
Asahi Kasei Kogyo Kabushiki Kaisha
Michl Paul R.
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