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US 5,314,948 AGranted
Olefinic impact modifiers for, and blends with, thermoplastic polyester resins
AssigneesCopolymer Rubber, Chemical Corporation
InventorsCharles F. Pratt, Shrikant V. Phadke, Errol Olivier
Life of this patent
Estimating the term…
Abstract
Thermoplastic polyester, copolyester and polyblend molding compositions impact-modified by glycidyl methacrylate grafted EPDM exhibit high impact strength combined with good knit-line characteristics, when the grafted comonomer content exceeds 2 percent by weight in the impact modifier, it has a gel content in the range of from about 10 to about 80 weight percent.
Claims23
The method of producing a masterbatch for melt blending with a polyester matrix resin to improve its knit-line strength and toughness comprising reacting:
- (1) less than the full increment of a high molecular weight thermoplastic polyester matrix resin;
- (2) a rubber polymer in the molten phase selected from the group consisting essentially of the interpolymerization reaction product of ethylene, one or more C.sub.3 -C.sub.16 mono-olefins and a polyene;
- (3) a composition selected from the group consisting of an epoxy functional acrylate, an epoxy functional methacrylate, an epoxy functional acrylate in combination with a C.sub.1 -C.sub.18 alkyl acrylate and an epoxy functional methacrylate in combination with a C.sub.1 -C.sub.18 alkyl acrylate;
- and
- (4) an initiator present in an amount of at least 0.3 percent by weight of the rubber polymer to provide a reaction product having a gel content in the range of from about 10 to about 80 percent.
2 more elements
A masterbatch comprising the reaction product of:
- (1) less than the full increment of a high molecular weight thermoplastic polyester matrix resin;
- (2) a rubber polymer in the molten phase selected from the group consisting essentially of the interpolymerization reaction product of ethylene, one or more C.sub.3 -C.sub.16 mono-olefins and a polyene;
- (3) a composition selected from the group consisting of an epoxy functional acrylate, an epoxy functional methacrylate, an epoxy functional acrylate in combination with a C.sub.1 -C.sub.18 alkyl acrylate and an epoxy functional methacrylate in combination with a C.sub.1 -C.sub.18 alkyl acrylate;
- and
- (4) an initiator present in an amount of at least 0.3 percent by weight of the rubber polymer to provide a reaction product having a gel content in the range of from about 10 to about 80 percent.
2 more elements
Dependencies are inferred from the claim text.