Foamed thermoplastic polyurethane and microwave molded body thereof
AssigneeSunko Ink Co., Ltd.
InventorsTing-Kai Huang, Yi-Jung Huang, Hsin-Hung Lin, Hong-Yi Lin, Ya-Chi Wang
Life of this patent
Estimating the term…
Abstract
The present invention relates to a foamable composition used to prepare foamed thermoplastic polyurethane and a microwave molded body thereof. The foamable composition includes unfoamed thermoplastic polyurethane particles, a thickener or a bridging agent, and a foaming agent, wherein the unfoamed thermoplastic polyurethane particles have a viscosity of 1,000 poise to 9,000 poise measured at 170° C. according to JISK 7311 test method.
Claims18
A microwave molded body, wherein the microwave molded body is formed by placing particles of foamed thermoplastic polyurethane in a mold and subjecting the particles of foamed thermoplastic polyurethane to microwave at a second foaming stage, the particles of the foamed thermoplastic polyurethane are prepared through foaming and pelletizing of a foamable composition in a screw pelletizer at a first foaming stage, and the foamable composition comprises:
- 100 parts by weight of unfoamed thermoplastic polyurethane particles, 5 to 25 parts by weight of a foaming agent, and 0.5 to 5 parts by weight of a thickener or a bridging agent, wherein the thickener is selected from an inorganic thickener or a cellulose thickener, wherein the unfoamed thermoplastic polyurethane particles have a viscosity of 1,000 poise to 9,000 poise measured at 170° C. according to JISK 7311 test method.
A method of manufacturing a microwave molded body, comprising:
- providing a foamable composition comprising:
- 100 parts by weight of unfoamed thermoplastic polyurethane particles, the unfoamed thermoplastic polyurethane particles have a viscosity of 1,000 poise to 9,000 poise measured at 170° C. according to JISK 7311 test method;
- 5 to 25 parts by weight of a foaming agent;
- and
- 0.5 to 5 parts by weight of a thickener or a bridging agent, wherein the thickener is selected from an inorganic thickener or a cellulose thickener;
- foaming and pelletizing of the foamable composition in a screw pelletizer at a first foaming stage to obtain particles of foamed thermoplastic polyurethane;
- and
- placing the particles of foamed thermoplastic polyurethane in a mold and subjecting the particles of foamed thermoplastic polyurethane to microwave at a second foaming stage to obtain the microwave molded body.
Dependencies are inferred from the claim text.