Method for making multidimensional polyester oligomers
AssigneeThe Boeing Company
InventorsHyman R. Lubowitz, Clyde H. Sheppard
Life of this patent
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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 dialcohols (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.
Claims15
A method for making a multidimensional polyester oligomer comprising the step of:
- condensing about 1 mole of an aromatic hub that has at least three --COX functionalities with at least 3 moles of an imidophenol of the formula:
- D.sub.i --.phi.--OH
- wherein
- i=1 or 2;
- .phi.=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;
- Me-methyl;
- and
- X=halogen.
A method for making a multidimensional polyester oligomer comprising the step of:
- condensing s mixture of about 1 mole of an aromatic hub that has at least three --COX functionalities with at least 3 moles of a dialcohol and at least about 3 moles of an acid halide of the formula:
- D.sub.i --.phi.--COX
- wherein
- i=1 or 2;
- .phi.=phenyl;
- D= ##STR24## 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.
A method for making a multidimensional, polyester oligomer comprising the step of:
- condensing a mixture of about 1 mole of an aromatic hub that has at least about three --OH functionalities with at least about 3 moles of a dicarboxylic acid halide and at least about 3 moles of an imidophenol of the formula:
- D.sub.i --.phi.--OH
- wherein D= ##STR34## 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 --S.sub.2 --;
- T=methallyl or allyl;
- Me=methyl;
- i=1 or 2;
- and
- .phi.=phenyl.
Dependencies are inferred from the claim text.