Polymer composition
AssigneeBP Chemicals Limited
InventorJeffrey D. Umpleby
Life of this patent
Estimating the term…
Abstract
A crosslinkable composition comprising a silyl modified ethylene (co)polymer, a defined phosphorus or antimony compound and optionally a silanol condensation catalyst. The silyl modified polymer has hydrolysable silane groups introduced therein by copolymerization grafting or transesterification. The phosphorus or antimony compound (e.g. tributyl phosphite) reduces premature crosslinking during extrusion of the composition.
Claims16
A crosslinkable composition comprising a silyl modified ethylene (co) polymer and a phosphorus or antimony compound containing at least one X-R group wherein X represents the phosphorus or antimony, R is a hydrogen atom or is an organic substituent which is bonded to atom X via a carbon or oxygen atom and wherein X is in the trivalent or pentavalent state and further comprising a silanol condensation catalyst.
A process for the prepartion of a crosslinkable composition comprising feeding to an extruder
- (a) organic polymer comprising polyethylene or a copolymer of ethylene with up to 40% by weight of one or more alpha-olefins, vinyl ethers, vinyl esters, alkyl(meth) acrylates or unsaturated nitriles,
- (b) 0.1-10 weight %, based on said organic polymer, of an unsaturated silane compound having hydrolysable organic groups,
- (c) 0.01 to 1 weight %, based on said organic polymer, of an organic peroxy free-radical initiator,
- (d) 0.001 to 3.0 moles, per mole of unsaturated silane compound, of a silanol condensation catalyst, and
- (e) 0.001 to 3.0 moles, per mole of unsaturated silane compound, of a phosphorus or antimony compound containing at least one X-R group wherein X represents the phosphorus or antimony, R is a hydrogen atom or is an organic substituent which is bonded to atom X via a carbon or oxygen atom and wherein X is in the trivalent or pentavalent state,
- under conditions such that the mixture forms a homogeneous melt and the unsaturated silane compound becomes grafted to the organic polymer.
A process for reducing the tendency to undergo premature crosslinking of a crosslinkable composition comprising a silyl modified ethylene (co) polymer,
- which process comprises incorporating into said crosslinkable composition, an amount effective to reduce the tendency to undergo premature crosslinking,
- of a phosphorus compound or an antimony compound, containing at least one X-R group wherein X represents the phosphorus or antimony, R is a hydrogen atom or is an organic substituent which is bonded to atom X via a carbon oxygen atom and wherein X is in the trivalent or pentavalent state, and further comprising a silanol condensation catalyst.
Dependencies are inferred from the claim text.