The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Feb. 27, 2007
Filed:
Dec. 15, 2003
Wayne Robert Furlan, Hellertown, PA (US);
Mark Leo Listemann, Kutztown, PA (US);
Joan Sudbury-holtschlag, Auburn, MI (US);
Thomas John Markley, Blandon, PA (US);
Gary Dale Andrew, Walnutport, PA (US);
Wayne Robert Furlan, Hellertown, PA (US);
Mark Leo Listemann, Kutztown, PA (US);
Joan Sudbury-Holtschlag, Auburn, MI (US);
Thomas John Markley, Blandon, PA (US);
Gary Dale Andrew, Walnutport, PA (US);
Air Products and Chemicals, Inc., Allentown, PA (US);
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 %.