Flame retardant recycled polyester copolymers
AssigneeMonsanto Company
InventorJawed Asrar
Life of this patent
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Abstract
A flame retardant linear polyester comprising the product of recycled polyethylene terephthalate, bis-hydroxy alkyl bibenzoate and a flame-retarding amount of a carboxy-phosphinic acid, a process for producing the polyester and products produced from the polyester are disclosed.
Claims45
A flame retardant linear polyester comprising the product of:
- a recycled polyester;
- a hydroxy ethyl dicarboxylate compound having the general formula:
- HO--(CH.sub.2).sub.n --O--CO--R--CO--O--(CH.sub.2).sub.n --OH
- wherein n is a number from 1 to 8 and R is selected from the group consisting of aliphatic groups having from 2 to about 12 carbon atoms;
- substituted benzene wherein the substituent is a halogen, an alkyl group having a carbon chain of from 1 to about 8 carbon atoms, or a phenyl or substituted phenyl group;
- naphthyl and substituted naphthyl wherein the substituent is hydrogen, halogen, an alkyl group having a carbon chain of from 1 to about 8 carbon atoms, or phenyl and substituted phenyl;
- and a moiety having the general formula:
- --(C.sub.6 H.sub.3 R.sup.2)--R.sup.1 --(C.sub.6 H.sub.3 R.sup.2)--
- wherein R.sup.1 is selected from the group consisting of nil, oxygen, phenyl and substituted phenyl, an alkyl group having a carbon chain of from 1 to about 8 carbon atoms, and --HC.dbd.CH-- and wherein each R.sup.2 is independently selected from the group consisting of hydrogen, halogen, an alkyl group having a carbon chain having from 1 to about 8 carbon atoms, and phenyl and substituted phenyl;
- a flame retardant amount of a carboxy-phosphinic acid having the general formula:
- ##STR3## wherein R is selected from the group consisting of saturated open-chain or cyclic alkylene radicals having from one to about 15 carbon atoms, and arylene and aralkylene radicals having from 1 to about 15 carbon atoms and R.sup.1 is selected from the group consisting of alkyl radicals having up to about 6 carbon atoms, aryl radicals and alkaryl radical wherein the alkyl substituent has from 1 to about 6 carbon atoms.
A flame retardant linear polyester comprising the product of recycled polyethylene terephthalate, bis-hydroxy alkyl bibenzoate and a flame-retarding carboxy-phosphinic acid monomer, the carboxy-phosphinic acid monomer being present in an amount of from about 0.1% to about 10% by weight based upon the total weight of the polyester.
A flame retardant linear polyester comprising the product of recycled polyethylene terephthalate, bis-hydroxy alkyl naphthanate and a flame-retarding carboxy-phosphinic acid monomer, the carboxy-phosphinic acid monomer being present in an amount of from about 0.1% to about 10% by weight based upon the total weight of the polyester.
A process for the production of a flame retardant linear polyester comprising condensing a mixture of recycled polyester, bis-hydroxy alkyl bibenzoate and a flame-retarding amount of a carboxy-phosphinic acid monomer in the presence of a catalyst at a temperature between about 250.degree. C. and about 293.degree. C.
A process for the production of a flame retardant linear polyester comprising condensing a mixture of recycled polyethylene terephthalate, bis-hydroxy alkyl bibenzoate and a flame-retarding carboxy-phosphinic acid monomer, the carboxy-phosphinic acid monomer being present in an amount of from about 0.1% to about 10% by weight based upon the total weight of the polyester, in the presence of a catalyst at a temperature between about 250.degree. C. and about 293.degree. C.
A process for the production of a flame retardant linear polyester comprising condensing a mixture of recycled polyester, a dicarboxylic acid, a diol and a flame-retarding amount of a carboxy-phosphinic acid monomer in the presence of a catalyst at a temperature between about 250.degree. C. and about 293.degree. C.
A shaped article comprising a flame retardant linear polyester comprising the product of recycled polyester, dicarboxylic acid and a flame-retarding amount of 2-carboxyethyl(phenyl)phosphinic acid.
Dependencies are inferred from the claim text.