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Solid feeding of silane crosslinking agents into extruder
| Details |
Inventors: Furrer, Willy; Schombourg, Jacques J. F. J.;
Assignee: Union Carbide Chemicals & Plastics Technology Corporation (Danbury, CT)
Primary Examiner: Marquis; Melvyn I.
Assistant Examiner: Aylward; D. E.
Attorney, Agent or Firm: Gray; William F.
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. |
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DETAILED DESCRIPTION OF THE INVENTION Base Polymer The base polymer is the polymer to be modified by the process of the present invention.
Such a base polymer is a thermoplastic polymer.
The base polymer employed in the invention may be either a homopolymer of an alpha-olefin having 2 to 6 carbon atoms or a copolymer of two alpha-olefins, e.
g.
, copolymers of ethylene; propylene; 1-butene; 1-pentene; 1-hexene; 1-octene; isobutylene; 2-methyl-1-butene; 3-methyl-1-butene; 2-methyl-1-pentene; 3-methyl-1-pentene; 4-methyl-1-pentene; 2,3-dimethyl-1-butene; 3,3-dimethyl-1-butene; and 2-ethyl-1-butene.
Other polymers useful in this invention include ethylene vinyl acetate copolymer (EVA), ethylene alkyl acrylate copolymers such as ethylene ethylacrylate (EEA), and ethylene acrylic acid copolymer.
Modified poly-alpha-olefins such as chlorinated polyethylene may also be useful in this invention.
Mixtures of two or more base polymers may also be used.
The base polymer is added to the extruder as a solid, generally in pellet or granular form.
Preferably the base polymer is polyethylene or a copolymer of ethylene and one of the above monomers.
Most preferably, the base polymer is homopolymer of ethylene or a copolymer of ethylene with 1-butene, 1-hexene, 1-octene, or 4-methyl-1-pentene.
Silane Silanes suitable for grafting onto and crosslinking with a base polymer according to the present invention include silanes of the general formula: ##STR1## wherein: R' represents a hydrogen atom or methyl group; x and y are 0 or 1 with the provisio that when x is 1, y equals 1; n is an integer from 1 to 12 inclusive, preferably 1 to 4; and each R independently represents a hydrolyzable organic group such as an alkoxy group having 1 to 12 carbon atoms (e.
g.
methoxy, ethoxy, butoxy), aryloxy group (e.
g.
phenoxy), aralkoxy (e.
g.
benzyloxy), aliphatic acyloxy group having 1 to 12 carbon atoms (e.
g.
formyloxy, acetyloxy, propanoyloxy), oximo or substituted amino groups (alkylamino and arylamino), or a lower alkyl group having 1 to 6 carbon atoms inclusive, with the proviso that not more than one of the three R groups is an alkyl
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