Shaped polyurethane articles and a method for making them
US3941855A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jul 22, 1974 |
| Grant date | Mar 2, 1976 |
| Priority date | — |
| Expiry date | Jul 22, 1994 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01B3/302
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
A shaped polyurethane product having improved arc-resistance, current leakage properties and dimensional stability which adapt it to be used as an electrical insulator is made by shaping a reactive mixture containing PA0 A. a polyisocyanate having only cycloaliphatic isocyanato groups, PA0 B. a polyisocyanate having only cycloaliphatic and aliphatic isocyanato groups, or PA0 C. a mixture of (a) or (b) with an aliphatic polyisocyanate, with a polyol mixture containing PA0 D. 5 to 30 percent by weight, based on the total weight of the polyol mixture of a polyol or polyol mixture having a molecular weight below about 1000 in which the hydroxyl groups are only cycloaliphatically or aliphatically bound and at least 50% thereof are cycloaliphatically bound; and PA0 E. 70 to 90 percent by weight of a polyol or polyol mixture having a molecular weight below 1000 in which the hydroxyl groups are substantially all aliphatically bound.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.