Jimmie Loe Echols

US Patent:

49488597, Aug 14, 1990

Filed:

Oct 28, 1988

Appl. No.:

7/263713

Inventors:

Jimmie L. Echols - Maplewood MN
Walton J. Hammar - St. Paul MN
Thomas A. Kotnour - Faribault MN

Assignee:

Minnesota Mining and Manufacturing Company - St. Paul MN

International Classification:

C08G 1808
C08G 1867

US Classification:

528 28

Abstract:

Bulk polymerization process for making radiation curable polyurethanes which comprises: (A) providing the following raw materials: (1) diisocyanate; (2) oligomeric diol>400 molecular weight; and (3) >1 chain extending monomer; (B) reacting the raw materials in a twin screw extruder under the following conditions: (1) molar ratio of isocyanate to hydroxy moieties of about 1; (2) ratio of chain extending monomer to other monomers sufficient to yield a polymer having chain extender incorporated at 0. 1 to 10 weight percent; (3) extruder temperature sufficient to initiate and maintain reaction; and (4) residence time sufficient to obtain substantially complete reaction of diisocyanate; (C) cooling product polymer. Polyurethane product has weight average molecular weight greater than 80,000 and acrylate or methacrylate functionality. Process permits continuous production of radiation curable polyurethanes having narrow molecular weight distribution and high tensile strength.

Address:

12330 8 St Ct, Afton, MN 55001

Phone:

(651)4366926

VIN:

JH2AF60617K301957

Make:

HONDA

Model:

CHF50

Year:

2007