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US 5,128,073 AGranted
Expanding thermoplastic resin beads with very high frequency energy
AssigneeGeneral Electric Company
InventorsRichard B. Allen, Bang M. Kim, David S. Miller, III
Life of this patent
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Abstract
Expandable thermoplastic resin beads coated with a novel very high frequency energy absorbing material are expanded with microwave energy.
Claims52
A process for producing a foamed thermoplastic resin article from expandable thermoplastic resin beads comprising:
- (a) providing a thermoplastic resin in particulate form impregnated with a blowing agent;
- (b) coating the particulate thermoplastic resin with an effective amount of a very high frequency energy absorbing organic material or its water solution or organic material coated on a substrate selected from the group consisting of alkanolamines, alkyl glycols and polyalkylene glycols or the water solutions or coatings on a substrate thereof;
- (c) delivering the coated particles to a very high frequency energy transparent vessel;
- and
- (d) expanding said coated particles with very high frequency energy sufficient to fuse the coated particles.
2 more elements
A foamed thermoplastic article produced from expandable thermoplastic resin beads by a process comprising:
- (a) providing a thermoplastic resin in particulate form impregnated with a blowing agent;
- (b) coating the particulate thermoplastic resin with an effective amount of a very high frequency energy absorbing material or its water solution or organic material coated on a substrate selected from the group consisting of alkanolamines, alkyl glycols, and polyalkylene glycols or the water solutions or coatings on a substrate thereof;
- (c) delivering the coated particles to a very high frequency energy transparent vessel;
- and
- (d) expanding said coated particles with very high frequency energy sufficient to fuse the coated particles.
2 more elements
Dependencies are inferred from the claim text.