# US 4,397,965 A · Expandable and curable polyester resin composition and method for making same

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- Number: US 4,397,965 A
- Document ID: US4397965A
- Status: Granted
- Kind: A
- Application number: 06/334,787
- Filed: 1981-12-28
- Granted: 1983-08-09
- Earliest claimed: 1981-12-28
- Assignees: Uniroyal, Inc.
- Inventors: Paul E. Stott
- Web page: https://patentgrep.com/patent/US4397965A

## CPC

- C08J 9/10: developing nitrogen {, the blowing agent being a compound containing a nitrogen-to-nitrogen bond}
- C08J 2367/06: Unsaturated polyesters
- 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)

## Abstract

An expandable and curable polyester composition comprising a mixture of a liquid, ethylenically unsaturated polyester resin composition; a peroxide; an organometallic promotor; and a dialkyl or trialkyl hydrazine is disclosed. In addition, a method for forming said expanded and cured polyester resin composition, and the product formed in accordance with said method, an expanded and cured polyester resin composition, is taught.

## Claims

### Claim 1

An expandable and curable polyester composition comprising a mixture of
a liquid, ethylenically unsaturated polyester resin;
a peroxide;
an organo metallic promoter; and
a hydrazine having the structural formula RR.sup.1 NNHR.sup.2
wherein R and R.sup.1 may be the same or different and are C.sub.1 -C.sub.18 alkyl, C.sub.2 -C.sub.18 alkenyl, C.sub.3 -C.sub.10 cycloalkyl, C.sub.7 -C.sub.9 aralkyl, or R and R.sup.1 together are C.sub.2 -C.sub.5 alkylene, C.sub.4 -C.sub.5 alkenylene or C.sub.3 -C.sub.4 oxydialkylene; R.sup.2 is hydrogen, C.sub.1 -C.sub.12 alkyl, C.sub.2 -C.sub.12 alkenyl, C.sub.5 -C.sub.6 cycloalkyl, or C.sub.7 -C.sub.9 aralkyl.

### Claim 2 (depends on 1)

A composition in accordance with claim 1 wherein R.sup.2 in said structural formula for hydrazine is hydrogen and said structural formula for said hydrazine is RR.sup.1 NNH.sub.2.

### Claim 3 (depends on 2)

A composition in accordance with claim 2 wherein R and R.sup.1 are the same or different and are C.sub.1 -C.sub.4 alkyl, cyclohexyl, benzyl or R and R.sup.1 together are C.sub.4 -C.sub.5 alkylene or C.sub.4 oxydialkylene.

### Claim 4 (depends on 1)

A composition in accordance with claim 1 wherein R and R.sup.1 are the same or different and are C.sub.1 -C.sub.12 alkyl, cyclohexyl, benzyl, xylyl or R and R.sup.1 together are methylene or oxydiethylene; R.sup.2 is hydrogen or C.sub.1 -C.sub.2 alkyl.

### Claim 5 (depends on 1)

A composition in accordance with claim 1, wherein said composition includes a surfactant.

### Claim 6 (depends on 1)

A composition in accordance with claim 1, wherein said mixture includes an inert filler.

### Claim 7 (depends on 1)

A composition in accordance with claim 1, wherein said hydrazine is present at a concentration of 0.32 to 70 millimoles per 100 grams of said unsaturated polyester resin.

### Claim 8 (depends on 7)

A composition in accordance with claim 7 wherein said hydrazine compound is present at a concentration of 1 to 50 millimoles per hundred grams of said unsaturated polyester resin.

### Claim 9 (depends on 8)

A composition in accordance with claim 8 wherein said hydrazine compound is present at a concentration of 3.2 to 15 millimoles per hundred grams of said unsaturated polyester resin.

### Claim 10

A method for making an expanded and cured polyester resin composition by preparing a mixture comprising:
a liquid, ethylenically unsaturated polyester resin;
a peroxide;
an organo metallic promoter; and
a hydrazine having the structural formula RR.sup.1 NNHR.sup.2
wherein R and R.sup.1 may be the same or different and are C.sub.1 -C.sub.18 alkyl, C.sub.2 -C.sub.18 alkenyl, C.sub.3 -C.sub.10 cycloalkyl, C.sub.7 -C.sub.9 aralkyl, or R and R.sup.1 together are C.sub.2 -C.sub.5 alkylene, C.sub.4 -C.sub.5 are alkenylene or C.sub.3 -C.sub.4 thiodialkylene; R.sup.2 is hydrogen, C.sub.1 -C.sub.12 alkyl, C.sub.2 -C.sub.12 alkenyl, C.sub.5 -C.sub.6 cycloalkyl, or C.sub.7 -C.sub.9 aralkyl.

### Claim 11 (depends on 10)

A method in accordance with claim 10 wherein R.sup.2 in said hydrazine structural formula is hydrogen and said hydrazine structural formula is RR.sup.1 NNH.sub.2.

### Claim 12 (depends on 11)

A method in accordance with claim 11 wherein R and R.sup.1 are the same or different and are C.sub.1 -C.sub.4 alkyl, cyclohexyl, benzyl or R and R.sup.1 together are C.sub.4 -C.sub.5 alkylene or C.sub.4 oxydialkylene.

### Claim 13 (depends on 10)

A method in accordance with claim 10 wherein R and R.sup.1 are the same or different and are C.sub.1 -C.sub.12 alkyl, cyclohexyl, benzyl, xylyl or R and R.sup.1 together are methylene or oxydiethylene, R.sup.2 is hydrogen or C.sub.1 -C.sub.3 alkyl.

### Claim 14 (depends on 10)

A method in accordance with claim 10 wherein a surfactant is added to said mixture.

### Claim 15 (depends on 10)

A method in accordance with claim 10 wherein said mixture includes an inert filler.

### Claim 16 (depends on 10)

A method in accordance with claim 10 wherein said hydrazine is present at a concentration of 0.32 to 70 millimoles per 100 grams of unsaturated polyester resin.

### Claim 17 (depends on 16)

A method in accordance with claim 16 wherein said hydrazine is present at a concentration of 1 to 50 millimoles per 100 grams of said unsaturated polyester resin.

### Claim 18 (depends on 16)

A method in accordance with claim 16 wherein said hydrazine compound is present at a concentration of 3.2 to 15 millimoles per 100 grams of said unsaturated polyester resin.