Richard K Hallmark

US Patent:

48534196, Aug 1, 1989

Filed:

Apr 7, 1988

Appl. No.:

7/178942

Inventors:

Richard K. Hallmark - Largo FL
Ernest K. Moss - Clearwater FL

Assignee:

Sloss Industries Corporation - Birmingham AL

International Classification:

C08G 1800
C08G 1814

US Classification:

521172

Abstract:

A storage stable polyester polyol mixture is prepared by (a) digesting polyethylene terephthalate with a digesting medium comprising a polycarboxylic acid component-containing polyol derived from a digesting polycarboxylic acid component and a digesting polyol component to form a digested polyol mixture and liberate ethylene glycol from said polyethylene terephthalate, and (b) distilling from said digested polyol mixture the amount of liberated ethylene glycol sufficient for improved storage stability of the mixture. The polyester polyol mixture is useful in the preparation of cellular foam materials, particularly polyisocyanurate and polyurethane foams.

US Patent:

48732680, Oct 10, 1989

Filed:

Oct 14, 1986

Appl. No.:

6/917887

Inventors:

Richard K. Hallmark - Largo FL
Michael J. Skowronski - Clearwater FL
William D. Stephens - Pinellas Park FL

Assignee:

Sloss Industries Corporation - Birmingham AL

International Classification:

C08G 1814

US Classification:

521 485

Abstract:

A storage stable polyester polyol mixture is prepared by digesting polyalkylene terephthalate, particularly polyethylene terephthalate, with a digesting medium comprising a polycarboxylic acid component-containing polyol, wherein the polycarboxylic acid component has ring units with two ##STR1## groups on adjacent or alternate ring positions, the ring unit content of the polycarboxylic acid component being sufficient for improved storage stability of the digestion product. The polyester polyol mixture is useful in the preparation of cellular foam materials, particularly polyisocyanurate and polyurethane foams.

US Patent:

47586079, Jul 19, 1988

Filed:

Jul 18, 1985

Appl. No.:

6/756107

Inventors:

Richard K. Hallmark - Largo FL
Ernest K. Moss - Clearwater FL

Assignee:

Sloss Industries Corporation - Birmingham AL

International Classification:

C08G 1814

US Classification:

521172

Abstract:

A storage stable polyester polyol mixture is prepared by (a) digesting polyethylene terephthalate with a digesting medium comprising a polycarboxylic acid component-containing polyol derived from a digesting polycarboxylic acid component and a digesting polyol component to form a digested polyol mixture and liberate ethylene glycol from said polyethylene terephthalate, and (b) distilling from said digested polyol mixture the amount of liberated ethylene glycol sufficient for improved storage stability of the mixture. The polyester polyol mixture is useful in the preparation of cellular foam materials, particularly polyisocyanurate and polyurethane foams.

US Patent:

45393419, Sep 3, 1985

Filed:

Feb 22, 1984

Appl. No.:

6/582348

Inventors:

Richard K. Hallmark - Largo FL
Michael J. Skowronski - Clearwater FL
William D. Stephens - Pinellas Park FL

Assignee:

Jim Walter Resources, Inc. - Birmingham AL

International Classification:

C08G 1814

US Classification:

521172

Abstract:

A storage stable polyester polyol mixture is prepared by digesting polyalkylene terephthalate, particularly polyethylene terephthalate, with a digesting medium comprising a polycarboxylic acid component-containing polyol, wherein the polycarboxylic acid component has ring units with two ##STR1## groups on adjacent or alternate ring positions, the ring unit content of the polycarboxylic acid component being sufficient for improved storage stability of the digestion product. The polyester polyol mixture is useful in the preparation of cellular foam materials, particularly polyisocyanurate and polyurethane foams.