Process for producing prepolymers which cure to improved sealants, and products formed thereby
US5990257A · kind A · utility
80Cited by
15References
18Claims
0Family size
Assignee
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Key dates
| Filing date | Jan 22, 1998 |
| Grant date | Nov 23, 1999 |
| Priority date | — |
| Expiry date | Jan 22, 2018 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08G2190/00
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
Silylated polyurethanes exhibiting a superior combination of mechanical properties and which cure in reasonable time to a low-tack sealant, without excessive viscosity, are prepared by reacting a polyol component having terminal unsaturation of less than 0.2 meq/g with a diisocyanate component to form a hydroxyl-terminated prepolymer, and endcapping the prepolymer with an isocyanate silane of the formula OCN--R--Si--(X).sub.m (--OR.sup.1).sub.3-m wherein m is 0, 1 or 2, each R.sup.1 is alkyl containing 1 to 4 carbon atoms, each X is alkyl containing 1 to 4 carbon atoms, and R is a difunctional organic group.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.