James W GuthrieWashington, DC

3981904, Sep 21, 1976

Jul 24, 1975

5/598912

James Leverette Guthrie - Ashton MD
Clifton Leroy Kehr - Silver Spring MD

W. R. Grace & Co. - New York NY

C07C10144

260471C

A urethane polythiol, which can be a dithiol, is prepared by reacting a hydroxypolythiol, which can be dithiol, with an isocyanate such as a phenyl isocyanate, toluene diisocyanate, and the like.

3984456, Oct 5, 1976

Jul 24, 1975

5/598595

James Leverette Guthrie - Ashton MD
Clifton Leroy Kehr - Silver Spring MD

W. R. Grace & Co. - New York NY

C07C14426

260468E

A urethane polythiol, which can be a dithiol, is prepared by reacting a hydroxypolythiol, which can be a dithiol, with an isocyanate such as phenyl isocyanate, toluene diisocyanate, and the like.

4439553, Mar 27, 1984

Jan 17, 1983

6/458434

James L. Guthrie - Ashton MD
Clifton L. Kehr - Silver Spring MD

W. R. Grace & Co. - New York NY

C08G 1814

521159

This invention relates to hydrophilic, urethane-forming compositions and a method of forming polyurethanes having low residual, potentially carcinogenic, aromatic amines by adding scavengers comprising polyols end-capped with aliphatic polyisocyanates.

4384050, May 17, 1983

Oct 26, 1981

6/314554

James L. Guthrie - Ashton MD

W. R. Grace & Co. - New York NY

C08G 1814
C08G 1877
C08G 1832

521137

A flexible, hydrophobic polyurethane foam is produced by mixing together an aqueous phase which can optionally contain reinforcing fibers and surfactants and a resin phase comprising a prepolymer derived from a poly (oxy C. sub. 2-4 alkylene) diol having a molecular weight of at least about 1100, an MDI containing isocyanate product having a functionality greater than 2. 0 made of a mixture of MDI and isocyanate containing derivatives of MDI, and a monomeric polyol crosslinking agent having 3 or 4 hydroxyl equivalents per mole. The preferred polyol is trimethylolpropane and the diol is an equimolar mixture of Carbowax 1000 and Carbowax 1450. The diol and the polyol, such as trimethylolpropane, are present in a mole ratio in the range of 4:1 to 8:1 while the ratio of the isocyanate equivalents to the total hydroxyl equivalents is in the range of 2. 5:1 to 3. 5:1. The isocyanate containing product comprises less than 50% by weight of the prepolymer and Isonate 143L is the preferred isocyanate product. Flexible foams are obtained which are water-absorbing for medical or personal care applications.

4160076, Jul 3, 1979

Jul 15, 1977

5/816055

James L. Guthrie - Ashton MD
Donald J. Bach - Baltimore MD

W. R. Grace & Co. - New York NY

C08G 1814
C08G 1810
C08G 1848

521159

The invention disclosed is for new improved hydrophilic crosslinked polyurethane foams which simulate natural sponges and prepared by reacting an isocyanate capped polyoxyethylene polyol reactant with an aqueous reactant and a carefully balanced combination of a nonionic surface-active agent and a liquid defoaming agent. The resultant foams are characterized by a majority of large size cells and membranes which themselves are foamed with small cells.

4661675, Apr 28, 1987

Aug 23, 1985

6/768656

James L. Guthrie - Ashton MD
Helen F. Roberts - Sudlersville MD
Christian B. Lundsager - Ashton MD

W. R. Grace & Co. - New York NY

B23K 1100
B23K 1110

219 9121

A weldable sealant composition is made by adding ferrous metal particles to a sealant having a viscosity of at least 6 million centipoises. The sealant composition is placed between two metal plates and permits resistance welding, i. e. spot welding, to take place.

4045472, Aug 30, 1977

Dec 15, 1975

5/640499

James Leverette Guthrie - Ashton MD
Clifton Leroy Kehr - Silver Spring MD

W. R. Grace & Co. - New York NY

C07C149437

260471C

The novel urethane polythiols of this invention are prepared by reacting: (a) a mono-, di-, or trihydric polythiol with a polymeric isocyanate; or (b) a di- or trihydric polythiol with a diisocyanate.

4061864, Dec 6, 1977

Jan 26, 1976

5/652239

James Leverette Guthrie - Ashton MD
Shrikant Vishwanath Dighe - Bethesda MD

W. R. Grace & Co. - New York NY

C07C101447

560 26

This invention is directed to thiol containing compounds having no hydrolytically sensitive groupings which are useful as polymerization transfer agents or as curing agents in curable polymer systems containing polyenes and a free radical initiator. The thiol containing compounds are formed by reacting a polyol with an allylic halide to form a poly(unsaturated ether) whose double bonds are converted to thioesters by free radical catalyzed addition of SH groups from a thiolcarboxylic acid, e. g. thioacetic acid and the like. Hydrolysis of the thioester yields the desired thiol or polythiol derivative. Alternatively the poly(unsaturated ether) is reacted with H. sub. 2 S to give the desired thiol or polythiol directly in a single step. The polythiols can be chain extended by any difunctional compound that reacts with the hydroxy groups on the polythiol.