# US 7,465,321 B2 · Production of biopolymer film, fibre, foam and adhesive materials from soluble S-sulfonated keratin derivatives

> Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt

- Number: US 7,465,321 B2
- Document ID: US7465321B2
- Status: Granted
- Kind: B2
- Application number: 10/488,188
- Filed: 2002-08-30
- Published: 2005-03-10
- Granted: 2008-12-16
- Earliest claimed: 2001-08-31
- Assignees: Keratec Limited
- Inventors: Robert James Kelly; Alisa Dawn Roddick-Lanzilotta; Douglas Alexander Rankin; Warren Glenn Bryson
- Web page: https://patentgrep.com/patent/US7465321B2

## CPC

- C08J 5/18: Manufacture of films or sheets
- C08H 1/06: derived from horn, hoofs, hair, skin or leather
- C08J 9/28: by elimination of a liquid phase from a macromolecular composition or article, e.g. drying of coagulum
- D01F 4/00: Monocomponent artificial filaments or the like of proteins; Manufacture thereof
- C08J 2201/048: Elimination of a frozen liquid phase
- C08J 2389/00: Characterised by the use of proteins; Derivatives thereof
- Y10T 428/14: Layer or component removable to expose adhesive
- Y10T 428/28: Web or sheet containing structurally defined element or component and having an adhesive outermost layer
- Y10T 428/2852: Adhesive compositions
- C08J: WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H (working, e.g. shaping, of plastics B29)
- C08H: DERIVATIVES OF NATURAL MACROMOLECULAR COMPOUNDS (polysaccharides C08B; natural rubber C08C; natural resins or their derivatives C09F; bituminous materials C10)
- D01F: CHEMICAL FEATURES IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS; APPARATUS SPECIALLY ADAPTED FOR THE MANUFACTURE OF CARBON FILAMENTS
- Y10T: TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION

## Abstract

Film, fibre, foam and adhesive materials are produced from soluble S-sulfonated keratins. Once formed, the films, fibres, foams or adhesives are treated to modify the properties of the materials, in particular to improve the wet strength of the materials. Treatments used include removal of the S-sulfonate group by treatment with a reducing agent, treatment with an acid or treatment with a common protein crosslinking agent or treatment with a reduced form of keratin or keratin protein. The films are made by solvent casting a solution of S-sulfonated keratin proteins, the foam made by freeze-drying a solution of S-sulfonated keratin proteins and the fibres made by extruding a solution of a S-sulfonated keratin protein.

## Claims

### Claim 1

A porous solid foam or an adhesive material derived from S-sulfonated proteins.

### Claim 2 (depends on 1)

The foam or adhesive material as claimed in claim 1 where the S-sulfonated proteins comprise S-sulfonated wool keratin intermediate filament proteins.

### Claim 3 (depends on 1, 2)

The foam or adhesive material as claimed in claim 1 or claim 2 wherein the keratin proteins are reconstituted from a solution.

### Claim 4 (depends on 1, 2)

The material as claimed in claim 1 or claim 2 which is a foam.

### Claim 5 (depends on 1, 2)

The material as claimed in claim 1 or claim 2 which is an adhesive.

### Claim 6 (depends on 5)

The material of claim 5 which is in the form of an aqueous solution.

### Claim 7 (depends on 5)

The adhesive as claimed in claim 5 comprising a solution of S-sulfonated keratins.

### Claim 8 (depends on 5)

The adhesive as claimed in claim 5, also comprising a reductant selected from the group consisting of phosphine, thiol and mixtures thereof.

### Claim 9 (depends on 5)

An adhesive as claimed in claim 5 constituting a two pot adhesive in which one component is solution of S-sulfonated keratin protein and other component is solution of reduced keratins or reduced keratin peptides, that on combination react to form a crosslinked network and subsequently an adhesive.