Polyolefin thermoplastic silicone elastomers employing radical cure
US6479580B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Apr 30, 2001 |
| Grant date | Nov 12, 2002 |
| Priority date | — |
| Expiry date | May 2, 2021 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08L2312/00
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
Polyolefin thermoplastic elastomers are disclosed which are prepared by;(I) mixing(A) a thermoplastic resin comprising more than 50 percent by volume of a polyolefin resin, said thermoplastic resin having a softening point of 23° C. to 300° C.;(B) a silicone base comprising(B′) 100 parts by weight of a diorganopolysiloxane gum having a plasticity of at least 30 and having an average of at least 2 alkenyl groups per molecule, and optionally,(B″) up to 200 parts by weight of a reinforcing filler,the weight ratio of said silicone base to said polyolefin thermoplastic resin is from 35:65 to 85:15;(C) a radical initiator, present in an amount sufficient to cure said diorganopolysiloxane gum (B′); and(II) dynamically vulcanizing said diorganopolysiloxane gum,wherein at least one property of the thermoplastic elastomer selected from tensile strength or elongation is at least 25% greater than the respective property for a corresponding simple blend wherein said diorganopolysiloxane gum is not cured and said thermoplastic elastomer has an elongation of at least 25%.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.