US 4,288,399 AGranted

Process for low pressure molding thermoplastic elastomer compositions

AssigneePhillips Petroleum Company

InventorsRoy W. Siedenstrang, William H. Cornell

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Abstract

Compositions comprising a thermoplastic elastomer, e.g., radial block butadiene/styrene copolymer, solid resinous polymer, e.g., vinyl-substituted aromatics, and one or more specific polar compounds. The specific polar compounds are chosen from among simple and polymeric alkaline glycols, their mono and dialkyl ethers; ethanolamines, isopropanolamines, and their hydrocarbyl-substituted derivatives; liquid acrylonitrile/butadiene polymers; acrylonitrile/butadiene blends with homopolymers of polyvinyl chloride and styrene/acrylonitrile copolymers; and mixtures thereof. A method using these compositions for producing molded objects at a molding pressure of up to about 200 psig. Molded objects produced from these compositions and molded objects produced by this method of molding.

Claims7

Dependent claims

A method for preparing molded articles comprising:

(a) introducing into a mold and enclosing in the mold the molding composition consisting essentially of:
(1) a thermoplastic elastomer that is a normally solid, linear or radial teleblock copolymer comprising about 30 to about 100 weight percent of the total polymeric component of the composition,
(2) solid resinous polymer that is a polymer of a vinyl-substituted aromatic compound comprising from about 0 to about 70 weight percent of the total polymeric component of the composition, and
(3) an amount ranging from about 0.5 to about 20 parts by weight per 100 parts by weight thermoplastic elastomer of a polarizing agent selected from among ethanolamines, isopropanolamines, and their hydrocarbyl-substituted derivatives;
(b) applying microwave energy to said composition for a time sufficient to produce a moldable consistency in said molded composition;
(c) supplying sufficient pressure up to about 200 psig to said molding composition for a time sufficient to produce a molded article;
(d) cooling said mold and molded article;
and
(e) unmolding said cool molded article.

6 more elements

A method for preparing molded articles comprising:

(a) introducing into a mold and enclosing in the mold a molding composition consisting essentially of:
(1) a thermoplastic elastomer that is normally solid, linear or radial teleblock copolymer of butadiene-styrene copolymer comprising about 30 to about 100 weight percent of the total polymeric components of the composition,
(2) solid resinous polymer that is a polymer of a vinyl-substituted aromatic compound chosen from among homopolymers of said aromatic compound and copolymers of said aromatic compound with acrylonitrile or a conjugated diene, said polymer of a vinyl-substituted aromatic compound comprising from about 0 to about 70 weight percent of the total polymeric component of the composition, and
(3) an amount ranging from about 0.5 to about 20 parts by weight per 100 parts by weight thermoplastic elastomer of a polarizing agent selected from among simple and polymeric alkylene glycols, their mono- and di-alkyl esters and mixtures thereof;
(b) applying microwave energy to said composition for a time sufficient to produce a moldable consistency in said molded composition;
(c) supplying sufficient pressure up to about 200 psig to said molding composition for a time sufficient to produce a molded article;
(d) cooling said mold and molded article;
and
(e) unmolding said cool, molded article.

6 more elements

Dependencies are inferred from the claim text.

Facts

Application: 05/825,175Filed 17 Aug 1977
Granted: 8 Sep 1981
Term ends: Not estimatedThe source records don’t support an estimate.

Classification16 codes

C08L 53/02
Compositions of block copolymers containing at least one sequence of a polymer obtained by reactions only involving carbon-to-carbon unsaturated…:…
B29C 35/08
Heating or curing, e.g. crosslinking or vulcanizing during moulding, e.g. in a mould: by wave energy or particle radiation
B29C 43/003
Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor: characterised by the choice of material
B29D 30/0005
Producing pneumatic or solid tyres or parts thereof: pretreatment of tyres or parts thereof, e.g. preheating, irradiation, precuring