David E Snider

US Patent:

20080096994, Apr 24, 2008

Filed:

Oct 11, 2005

Appl. No.:

11/660818

Inventors:

David Snider - Jasper GA, US

International Classification:

C08J 9/14
C08G 18/00
C08J 9/00

US Classification:

521098000, 521172000

Abstract:

The present invention relates to a polyisocyanate-based foam prepared in the presence of a blowing agent which comprises from 50 to 95 parts be weight 1,1,1,2-tetrafluoroethane (134a) and from 5 to 50 parts by weight of 1,1,1,3,3-pentafluoro-propane (245fa). Use of such a blowing agent composition provides for foam with a reduced smoke emission index.

US Patent:

20140364528, Dec 11, 2014

Filed:

Dec 13, 2011

Appl. No.:

13/880898

Inventors:

Eric M. Rexrode - Missouri City TX, US
David E. Snider - Jasper GA, US
Woo-Sung Bae - Midland MI, US
Mikhail Y. Gelfer - Sugarland TX, US
Jorge Jimenez - Lake Jackson TX, US

Assignee:

DOW GLOBAL TECHNOLOGIES LLC - Midland MI

International Classification:

C08G 18/48
C08G 18/76
C08G 18/08
C08G 63/668

US Classification:

521177, 528301, 525437

Abstract:

A polyol formulation comprising certain type of polyester polyols useful in the preparation of rigid polyurethane foams having low surface friability is provided. In one embodiment, a reaction system for production of a rigid foam is provided. The reaction system comprises a polyester polyol and one or more polyisocyanates, wherein the polyester polyol and the polyisocyanates are mixed in amounts sufficient to provide a rigid polyurethane foam. The polyester polyol comprises the reaction product of from 20 to 60 weight percent of an aromatic component comprising at least 80 mole percent or greater of terephthalic acid, from 20 to 60 weight percent of a polyethylene glycol having a number average molecular weight from 150 to 1,000, from 5 to 20 weight percent of a glycol having a functionality of 2 and molecular weight of 60 to 250 and from 5 to 20 weight percent of a glycol having a functionality of at least 3 and a molecular weight of 60 to 250.