Inventors:
Wayne Robert Furlan - Hellertown PA, US
Mark Leo Listemann - Kutztown PA, US
Thomas John Markley - Blandon PA, US
Gary Dale Andrew - Walnutport PA, US
Assignee:
Air Products and Chemicals, Inc. - Allentown PA
International Classification:
C08J 9/14
C08G 77/46
US Classification:
521112, 521114, 521128, 521129, 521130, 521131, 521170, 521172, 521173, 521174, 521176
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:(CH)—Si—O—(Si(CH)—O)—(Si(CH)(R)O)—Si(CH)whereR=(CH)—O—(—CH—CH—O)—(CH—CH(CH)—O)—R″, andwhere R″ is H, (CH)CH, or C(O)CH; 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 %.