# US 4,394,128 A · Method of sizing polyester yarn

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

- Number: US 4,394,128 A
- Document ID: US4394128A
- Status: Granted
- Kind: A
- Application number: 06/202,543
- Filed: 1980-10-31
- Granted: 1983-07-19
- Earliest claimed: 1980-10-31
- Assignees: Rohm and Haas Company
- Inventors: Hal C. Morris
- Web page: https://patentgrep.com/patent/US4394128A

## CPC

- D06M 15/263: of unsaturated carboxylic acids; Salts or esters thereof
- Y10T 428/2969: Polyamide, polyimide or polyester
- Y10T 442/3049: Including strand precoated with other than free metal or alloy
- D06M: TREATMENT, NOT PROVIDED FOR ELSEWHERE IN CLASS D06, OF FIBRES, THREADS, YARNS, FABRICS, FEATHERS OR FIBROUS GOODS MADE FROM SUCH MATERIALS
- Y10T: TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION

## Abstract

Taught is a method of sizing polyester yarn for weaving comprising the steps of applying thereto a latex having an acid pH and of a free radical initiated vinyl polymer having a weight average molecular weight of from about 300,000 to about 2,500,000, said polymer in dried film form being hydrophobic and not redispersible in a solution at a pH of from about 2 to 7 but redispersible by an aqueous alkaline medium, said polymer being prepared from monomers consisting essentially of by weight, 45-65% butyl acrylate a total of 28-45% styrene and/or methyl methacrylate and a total of 8-14% acrylic acid and/or methacrylic acid, and drying the yarn.

## Claims

### Claim 1

A method of sizing polyester yarn for weaving comprising the steps of (1) applying thereto a free radical initiated vinyl polymer latex having an acid pH and a weight average molecular weight from about 300,000 to 2,500,000; said polymer in dried film form being hydrophobic and not redispersible in a solution at a pH from about 2 to 7 but redispersible by an aqueous alkaline medium, said polymer being prepared from monomers consisting essentially of, by weight, 45 to 65% butyl acrylate, 28 to 45% styrene and/or methyl methacrylate, and 8 to 14% acrylic acid and/or methacrylic and (2) drying the yarn.

### Claim 2 (depends on 1)

The method of claim 1 in which said monomers consist essentially of butyl acrylate, styrene, and acrylic acid and/or methacrylic acid.

### Claim 3 (depends on 1)

The method of claim 1 in which said monomers consist essentially of butyl acrylate, methyl methacrylate; and acrylic acid and/or methacrylic acid.

### Claim 4 (depends on 2)

The method of claim 2 in which said acid is acrylic acid.

### Claim 5 (depends on 2)

The method of claim 2 in which said acid is methacrylic acid.

### Claim 6 (depends on 3)

The method of claim 3 in which said acid is acrylic acid.

### Claim 7 (depends on 3)

The method of claim 3 in which said acid is methacrylic acid.

### Claim 8 (depends on 1)

The method of claim 1 in which said monomer consist essentially of 50 to 60% butyl acrylate, 28 to 40% styrene and 10 to 13% acrylic acid.

### Claim 9 (depends on 1)

The method of claim 1 in which said monomers consist essentially of about 50 to 60% butyl acrylate, 28 to 40% styrene and 10 to 13% methacrylic acid.

### Claim 10 (depends on 1, 2, 3, 4, 5, 6, 7, 8)

Polyester yarn prepared by the method of claim 1, 2, 3, 4, 5, 6, 7, 8, or 9.

### Claim 11 (depends on 1, 2, 3, 4, 5, 6, 7, 8)

A method of weaving comprising the steps of preparing a polyester yarn in accordance with the method of claim 1, 2, 3, 4, 5, 6, 7, 8, or 9, weaving the yarn into fabric, and removing said vinyl polymer therefrom by an aqueous alkaline solution.

### Claim 12 (depends on 11)

A method in accordance with claim 11 in which the step of weaving is conducted by means of a water jet loom.