# US 5,705,598 A · Polyester sulfone oligomers and blends

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- Number: US 5,705,598 A
- Document ID: US5705598A
- Status: Granted
- Kind: A
- Application number: 07/137,493
- Filed: 1987-12-23
- Granted: 1998-01-06
- Earliest claimed: 1985-04-23
- Assignees: The Boeing Company
- Inventors: Hyman R. Lubowitz; Clyde H. Sheppard
- Web page: https://patentgrep.com/patent/US5705598A

## CPC

- C08G 63/21: in the presence of unsaturated monocarboxylic acids or unsaturated monohydric alcohols or reactive derivatives thereof
- C08G 63/00: Macromolecular compounds obtained by reactions forming a carboxylic ester link in the main chain of the macromolecule (polyester-amides C08G69/44; polyester-imides C08G73/16)
- C08G 63/185: containing two or more aromatic rings
- C08G 63/193: containing two or more aromatic rings
- C08G 63/6826: {Dicarboxylic acids and dihydroxy compounds}
- C08G 63/6856: {Dicarboxylic acids and dihydroxy compounds}
- C08G 63/6886: {Dicarboxylic acids and dihydroxy compounds}
- C08L 81/06: Polysulfones; Polyethersulfones
- C08J 2367/07: having terminal carbon-to-carbon unsaturated bonds
- C08L 67/00: Compositions of polyesters obtained by reactions forming a carboxylic ester link in the main chain (of polyester-amides C08L77/12; of polyester-imides C08L79/08); Compositions of derivatives of such polymers
- Y10T 428/31794: Of cross-linked polyester
- C08G: MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08L: COMPOSITIONS OF MACROMOLECULAR COMPOUNDS (compositions based on polymerisable monomers C08F, C08G; artificial filaments or fibres D01F; textile treating compositions D06)
- 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

High performance polyester sulfone oligomers are prepared for aerospace applications by condensing mono- or difunctional crosslinkable end caps (i.e. unsaturated hydrocarbons having one or two crosslinking sites) with dicarboxylic acid halides and dialcobols (i.e. diols). Multidimensional oligomers have an aromatic hub from which the polyester chains radiate. Blends of the linear and multidimensional oligomers can be made using compatible, non-crosslinking polymers. Prepregs and composites are formed from the oligomers or blends.

## Claims

### Claim 1

A method for making a polyester oligomer that is suitable for advanced composites comprising the step of:
condensing simultaneously under an inert atmosphere in a suitable solvent a mixture comprising about:
(i) 2 moles of a crosslinking end-cap phenol of the formula:
D.sub.i --.O slashed.--OH
wherein i=1 or 2;
.O slashed.=phenyl;
D= ##STR21## R.sub.1 =lower alkyl, lower alkoxy, aryl, aryloxy, substituted alkyl substituted aryl, halogen, or mixtures thereof;
j=0, 1, or 2;
G=--CH.sub.2 --, --O--, --S-- or --SO.sub.2 --;
T=methallyl or allyl; and
Me=methyl;
(ii) (n+1) moles of a dicarboxylic acid halide; and
(iii) n moles of a dialcohol, wherein n is an integer greater than or equal to 1.

### Claim 2

A method for making a polyester oligomer that is suitable for advanced composites comprising the step of:
condensing simultaneously under an inert atmosphere in a suitable solvent a mixture comprising about:
(i) 2 moles of a crosslinking end-cap acid halide of the formula:
D.sub.i --.O slashed.--COX
wherein i=1 or 2;
.O slashed.=phenyl;
D= ##STR22## R.sub.1 =lower alkyl, lower alkoxy, aryl, aryloxy, substituted alkyl, substituted aryl, halogen, or mixtures thereof;
j=0, 1, or 2;
G=--CH.sub.2 --, --O--, --S--, or --SO.sub.2 --;
T=methallyl or allyl; and
Me=methyl,
(ii) n moles of a dicarboxylic acid halide; and
(iii) (n+1) moles of a dialcohol, wherein n is an integer greater than or equal to 1.