IP Library › Granted Patent US 12698417
Granted Patent B2
US 12698417 · App. 18/069,508 · Granted Aug 4, 2026

Coatings containing polymer modified enzyme for stable self-cleaning of organic stains

Inventors: Hongfei Jia (Ann Arbor, MI); Ping Wang (North Oaks, MN); Liting Zhang (St. Paul, MN); Andreas Buthe (Steinfurt, DE); Xueyan Zhao (Circle Pines, MN); Songtao Wu (Ann Arbor, MI); Masahiko Ishii (Okazaki City, JP); Minjuan Zhang (Ann Arbor, MI)
Assignees: TOYOTA MOTOR CORPORATION; Regents of the University of Minnesota
C09D189/00A61K47/60C08G65/33337C09D5/024C09D5/16C09D7/40C09D175/16C12N9/14C12N9/20C12N9/2408C12N9/2411C12N9/54C12N9/96C12N11/06C12N11/089C08L2203/02C08L2205/02
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Quick Facts
Patent No.
US 12698417
App. No.
18/069,508
Granted
Aug 4, 2026
Kind
B2
Abstract

A process of stabilizing the activity of an enzyme against inactivation by water weathering are provided including associating one or more polymeric moieties of a polyoxyethylene having a molecular weight of 10,000 Daltons or greater with an enzyme to form a chemically modified enzyme; and dispersing said chemically modified enzyme in a base to form a water-stabilized active coating material.

Claims (10)

1 . A process of stabilizing the activity of an enzyme against water weathering in a coating composition comprising:

associating one or more polymeric moieties of a polyoxyethylene having a molecular weight of 10,000 Daltons or greater with an enzyme to form a chemically modified enzyme; and

dispersing said chemically modified enzyme in a base to form a water-stabilized active coating material.

2 . The process of claim 1 wherein said dispersing results in protein particles with an average particle diameter of less than 5 micrometers.

3 . The process of claim 1 further comprising coating a substrate with said active coating material such that said enzyme is capable of enzymatically degrading a component of an organic stain in contact with said active coating material.

4 . The process of claim 1 wherein said enzyme is a hydrolase.

5 . The process of claim 1 wherein said polyoxyethylene has a molecular weight between 1,000 and 15,000 Daltons.

6 . The process of claim 1 wherein said enzyme is an amylase.

7 . The process of claim 1 wherein said polyoxyethylene has a molecular weight of 10,000 Daltons to 20,000 Daltons.

8 . The process of claim 1 wherein said polyoxyethylene has a molecular weight of 12,000 Daltons or greater.