Graft copolymers of alkyl methacrylates--alkyl acrylates onto diene--alkyl acrylate copolymers and their use as impact modifiers
US4542185A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jun 22, 1984 |
| Grant date | Sep 17, 1985 |
| Priority date | — |
| Expiry date | Jun 22, 2004 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08L51/04
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
The impact resistance of resin compositions consisting of a thermoplastic polymer, particularly a homopolymer or copolymer of vinyl chloride can be improved by an impact additive of the graft copolymer type. The graft copolymer impact additive consists of a backbone composed of a statistical copolymer of butadiene or isoprene, an alkyl acrylate of a C.sub.2 to C.sub.12 alkyl, and optionally a polyfunctional cross-linking agent, onto which are grafted the chains of a statistical copolymer of an alkyl methacrylate of a C.sub.1 to C.sub.4 alkyl, particularly methyl methacrylate, and an alkyl acrylate of a C.sub.1 to C.sub.8 alkyl, particularly ethyl acrylate. The backbone of the graft copolymer impact additive comprises 0.5-35% by weight butadiene or isoprene, and up to 10 mole % of the cross-linking agent, while the graft chains of the graft copolymer comprise 5 to 50 mole % of the alkyl acrylate of a C.sub.1 to C.sub.8 alkyl, and the weight ratio between the grafted chains and the backbone can range from 10 to 200%. The resin compositions are particularly useful to improve impact strength at low temperatures.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.