Silicone surfactants for rigid polyurethane foam made with hydrocarbon blowing agents
US7183330B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Dec 15, 2003 |
| Grant date | Feb 27, 2007 |
| Priority date | — |
| Expiry date | Mar 3, 2024 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08J2483/00
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
A method for making a rigid polyurethane foam by reacting a polyisocyanate and a polyol in the presence of a urethane catalyst, a blowing agent and a silicone surfactant characterized by employing a blowing agent comprising a C4 or C5 hydrocarbon, or mixtures thereof, with an average molecular weight of ≦72 g/mole and a boiling point in the range of 27.8 to 50° C., and a silicone surfactant comprising a polyether-polysiloxane copolymer represented by the following formula:(CH3)3—Si—O—(Si(CH3)2—O)x—(Si(CH3)(R)O)y—Si(CH3)3 whereR=(CH2)3—O—(—CH2—CH2—O)a—(CH2—CH(CH3)—O)b—R″, andwhere R″ is H, (CH2)zCH3, or C(O)CH3; x+y+2 is 60–130; x/y is 5–14; z is 0–4; the total surfactant molecular weight, based on the formula, is 7000–30,000 g/mole, the wt % siloxane in the surfactant is 32–70 wt %, the blend average molecular weight (BAMW) of the polyether portion is 450–1000 g/mole, and the mole % of ethylene oxide in the polyether portion is 70–100 mole %.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.