Process for heat sealing polyurethane foam
US4302272A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jan 14, 1980 |
| Grant date | Nov 24, 1981 |
| Priority date | — |
| Expiry date | Jan 14, 2000 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S521/914
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
The instant invention is directed to a process for heat sealing flexible polyurethane foam, comprising: PA0 A. reacting and foaming a polyurethane foam produced by the steps comprising reacting: PA1 (I) an organic polyisocyanate; PA1 (II) a polyol having a molecular weight of 2,000 to 8,000 comprising the adduct obtained by sequentially reacting: PA2 (a) a polyhydroxyl initiator, with a functionality of 2 to 5 and a weight average molecular weight as determined by gel permeation chromatography of from 62 to 200; with PA2 (b) 10 to 90%, most preferably 10 to 50%, by weight, based on the total oxide present in (b)+(c)+(d), a first alkylene oxide; and subsequently reacting the product with PA2 (c) 10 to 80%, preferably 20 to 50% by weight, based on the total oxide present in (b)+(c)+(d), 4,4,4-trichloro-1,2-epoxybutane and/or epihalohydrin; and subsequently reacting the product with PA2 (d) 10 to 60%, most preferably 10 to 40%, by weight, based on the total oxide present in (b)+(c)+(d), a second alkylene oxide. PA1 (III) foaming agent; and optionally PA1 (IV) catalyst; PA0 B. heating a portion of the surface of said flexible polyurethane foam of (A) above its melting or fusion point; …
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.