Solid feeding of silane crosslinking agents into extruder
AssigneeUnion Carbide Chemicals & Plastics Technology Corporation
InventorsWilly Furrer, Jacques J. F. J. Schombourg
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Abstract
A process for producing a polymer crosslinkable by exposure to moisture in the presence of a hydrolysis/condensation catalyst comprising blending (i) a thermoplastic base polymer, (ii) a solid carrier polymer containing a silane, and (iii) a free radical generator; heating and mixing (i), (ii) and (iii) together at a temperature above the crystalline melting point of said base polymer; optionally, a free-radical generator, hydrolysis/condensation catalyst, and other additives are contained in the solid carrier polymer.
Claims29
A process for producing a polymer crosslinkable by exposure to moisture in the presence of a hydrolysis/condensation catalyst comprising:
- (a) blending
- (i) a thermoplastic base polymer selected from the group consisting of a homopolymer of an alpha-olefin having 2-6 carbon atoms, a copolymer of two alpha-olefins, a copolymer of ethylene and vinyl acetate, a copolymer of ethylene and ethyl acrylate, a copolymer of ethylene and acrylic acid, and mixtures of an ethylene vinyl acetate copolymer, ethylene ethyl acrylate copolymer, or ethylene acrylic acid copolymer with each other or with copolymers of ethylene and 1-butene, 1-hexene, 1-octene, or 4-methyl-1- pentene.
- (ii) a solid carrier polymer substantially free of water having contained therein a silane having the formula ##STR2## wherein R' represents a hydrogen or a methyl group;
- x and y are 0 or 1, with the proviso that when x is l, y equals l;
- n is an integer from 1 to 12 inclusive;
- each R independently represents a hydrolyzable organic group selected from the group consisting of alkoxy, aryloxy, aralkoxy, aliphatic acyloxy, oximo, alkylamino and arylamino, or a lower alkyl group having from 1 to 6 carbon atoms inclusive, with the proviso that no more than one of the three R groups is an alkyl;
- and
- (iii) a free radical generator;
- (b) heating and mixing (i), (ii) and (iii) together at a temperature above the crystalline melting point of said base polymer.
A process for producing a polymer crosslinkable by exposure to moisture in the presence of a hydrolysis/condensation catalyst comprising:
- (a) blending
- (i) a polyolefin polymer;
- (ii) a porous polymer compatible with said polyolefin and selected from the group consisting of high density polyethylene, low density polyethylene and linear low density polyethylene and wherein said porous polymer has a pore volume from about 30 to about 90 percent, a pore cross-section ranging from about 0.1 to about 5.mu.m, and a pore cell size ranging from about 1 to about 30.mu.m;
- said porous polymer having contained therein a vinylalkoxysilane;
- and
- (iii) a free radical generator;
- (b) heating and mixing (i), (ii) and (iii) together at a temperature above the crystalline melting point of said base polyolefin.
A process for producing crosslinked polymer comprising:
- (a) blending
- (i) a polyolefin polymer;
- (ii) a Porous polymer compatible with said polyolefin selected from the group consisting of high density polyethylene, low density polyethylene and linear low density polyethylene and wherein said porous polymer has a pore volume from about 30 to about 90 percent, a pore cross-section ranging from about 0.1 to about 5.mu.m, and a pore cell size ranging from about 1 to about 30.mu.m;
- said porous polymer having contained therein a vinylalkoxysilane;
- and
- (iii) a free radical generator;
- (b) heating and mixing (i), (ii) and (iii) together at a temperature above the crystalline melting point of said polyolefin polymer.
- (c) exposing the mixture of (b) to a hydrolysis/condensation catalysts and water.
Dependencies are inferred from the claim text.