# US 4,400,425 A · High impact chemically activated polyester fiber reinforced plastic composite

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- Number: US 4,400,425 A
- Document ID: US4400425A
- Status: Granted
- Kind: A
- Application number: 06/329,934
- Filed: 1981-12-11
- Granted: 1983-08-23
- Earliest claimed: 1980-03-21
- Inventors: Vladimir Vanha
- Web page: https://patentgrep.com/patent/US4400425A

## CPC

- B32B 5/26: another layer {next to it} also being fibrous or filamentary {(relative arrangement of fibres or filaments of different layers B32B5/12)}
- B29C 70/04: comprising reinforcements only, e.g. self-reinforcing plastics
- B32B 5/28: impregnated with or embedded in a plastic substance {(not used)}
- C08J 5/047: {with mixed fibrous material}
- C08J 5/06: using pretreated fibrous materials
- B32B 2262/0276: Polyester fibres
- B32B 2315/085: Glass fiber cloth or fabric
- Y10T 428/249987: With nonvoid component of specified composition
- Y10T 428/24999: Inorganic
- Y10T 428/249991: Synthetic resin or natural rubbers
- Y10T 428/31786: Of polyester [e.g., alkyd, etc.]
- Y10T 442/335: Plural fabric layers
- Y10T 442/3358: Including a nonwoven fabric layer
- Y10T 442/3691: Fabric layer contains glass strand material
- Y10T 442/3813: Coating or impregnation contains synthetic polymeric material
- B32B: LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B29C: SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING (making preforms B29B11/00; making laminated products by combining previously unconnected layers which become one product whose layers will remain together B32B37/00 - B32B41/00)
- 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)
- Y10T: TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION

## Abstract

A reinforced plastic composite structure is disclosed which includes a fiberglass reinforced plastic structure wherein adhesive-activated thermally stabilized polyester fibers are included affording highly improved impact resistance.

## Claims

### Claim 1

A high impact-fiber reinforced plastic composite structure comprising:
a resin matrix;
a plurality of treated chemically-activated polyester fibers included with said resin matrix and reinforcing fibers;
said polyester fibers being treated to have an adhesively activated surface prior to inclusion in said matrix enhancing the degree of fiber to resin adhesion in said resin matrix providing coherent bonding of said composite structure under high impact loads to effectively resist structural separation after initial impact.

### Claim 2 (depends on 1)

The structure of claim 1 wherein said reinforcing fibers and said polyester fibers are laminated in said composite structure.

### Claim 3 (depends on 2)

The structure of claim 2 wherein said polyester fibers include continuous filaments woven in a plain weave which is laminated in said structure.

### Claim 4 (depends on 1)

The structure of claim 1 wherein said composite structure comprises up to fifty percent weight of chemically-activated polyester fibers by fiber weight.

### Claim 5 (depends on 1)

The structure of claim 1 wherein said reinforcing fibers are glass.

### Claim 6 (depends on 2)

The structure of claim 2 including an inner core layer of synthetic foam material intermediate said reinforcing fiber layers providing increased rigidity and integrity to said structure.

### Claim 7

In a fiberglass reinforced thermoset resin construction, the improvement comprising:
inclusion of chemically-activated polyester fiber or fabric treated to have a chemically-activated surface prior to inclusion as an additional reinforcing element to increase the impact strength of the composite construction.