Polyurethane and polyisocyanurate rigid foams suitable for roofing insulation
US10676582B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Nov 15, 2016 |
| Grant date | Jun 9, 2020 |
| Priority date | — |
| Expiry date | Nov 15, 2036 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08J2375/06
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
Polyurethane foams having a NFPA 101 Class B rating (ASTM E-84) which pass the FM 4450 Calorimeter Test are produced by reacting: (a) an organic polyisocyanate, (b) at least one polyether polyol or polyester polyol with a nominal hydroxyl functionality of at least 2.0, (c) a blowing agent composition and (d) at least one halogen-free flame retardant. The blowing agent composition includes: (1) no more than 10% by weight, based on total weight of the foam-forming composition, of one or more hydrocarbons having an LEL less than 2% by volume in air, and/or (2) a hydrocarbon having an LEL greater than 2% by volume in air, and (3) up to 1% by weight, based on total weight of foam-forming composition, of water.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.