Copolyamide resins from piperazine and polyoxyalkylene diamine having improved creep resistance

Claim 2

A thermoplastic copolyamide adhesive resin having improved creep resistance consisting essentially of the polymeric reaction product of essentially stoichiometric amounts of: (a) a mixture of saturated aliphatic dicarboxylic acids containing a short-chain dicarboxylic acid having from 2 to 7 carbon atoms and a long-chain dicarboxylic acid having from 8 to 14 carbon atoms; (b) piperazine; and (c) a polyoxyalkylene diamine of the general formula ##STR2## where R is hydrogen or a methyl group and m is a positive integer such that the average molecular weight of the polyoxyalkylene diamine is between about 200 and 800; the equivalents ratio of the long- to short-chain dicarboxylic acids ranging from 0.5:0.5 to 0.9:0.1 and the equivalents ratio of the piperazine to polyoxyalkylene diamine ranging from 0.7:0.3 to 0.95:0.05.

Claim 3

The thermoplastic copolyamide adhesive resin of claim 1 which is further characterized by having an acid value less than 10, an amine value less than 20 and softening point in the range 100° C. to 200° C.

Claim 4

The thermoplastic copolyamide adhesive resin of claim 2 wherein the polyoxyalkylene diamine has an average molecular weight from 300 to 600 and the equivalents ratio of piperazine to polyoxyalkylene diamine is between 0.75:0.25 and 0.90:0.10.

Claim 5

The thermoplastic copolyamide adhesive resin of claim 3 wherein the polyoxyalkylene diamine is a polyoxypropylene diamine, the long-chain dicarboxylic acid has from 9 to 12 carbon atoms, the short-chain dicarboxylic acid has from 4 to 6 carbon atoms and the equivalents ratio of long- to short-chain dicarboxylic acids is between 0.65:0.35 and 0.80:0.20.

Claim 6

The thermoplastic copolyamide adhesive resin of claim 4 which is further characterized by having an acid value less than 7, amine value less than 13 and softening point in the range 120° C. to 170° C.

Claim 7

The thermoplastic copolyamide adhesive resin of claim 4 wherein the short-chain dicarboxylic acid is adipic acid and the long-chain dicarboxylic acid is azelaic acid.

Claim 8

The thermoplastic copolyamide adhesive resin of claim 6 which is further characterized by having a softening point in the range 135° C. To 155° C., 190° C. viscosity in the range 125 poise to 300 poise, tensile strength of 1400-1650 psi and elongation of 300-550%.

Claim 9

The thermoplastic copolyamide adhesive resin of claim 4 wherein the short-chain dicarboxylic acid is adipic acid and the long-chain dicarboxylic acid is sebacic acid.

Claim 10

A thermoplastic copolyamide adhesive resin having improved creep resistance consisting essentially of the polymeric reaction product of essentially stoichiometric amounts of a mixture of saturated aliphatic dicarboxylic acids containing a long-chain dicarboxylic acid having from 8 to 14 carbon atoms and a short-chain dicarboxylic acid having from 2 to 7 carbon atoms, the equivalents ratio of long- to short-chain dicarboxylic acids ranging from 0.5:0.5 to 0.9:0.1, and a mixture of piperazine and a polyoxyalkylene diamine of the formula ##STR3## where R is hydrogen or a methyl group and m is a positive integer such that the average molecular weight of the polyoxyalkylene diamine is between about 200 and 800, the equivalents ratio of piperazine to polyoxyalkylene diamine ranging from 0.7:0.3 to 0.95:0.05, and containing an amount up to 20 percent, based on the total amine equivalents, of an aliphatic, cycloaliphatic or aromatic amine having 2 to 10 carbon atoms, a dipiperidyl type diamine selected from the group consisting of 1,2-di(4-piperidyl)ethane, 1,3-di(4-piperidyl)propane and 1,4-di(4-piperidyl)butane or an N-substituted piperazine or dipiperidyl type diamine wherein the substituent is an aminoalkyl or hydroxyalkyl radical having from 1 to 4 carbon atoms.

Claim 11

A thermoplastic copolyamide adhesive resin having improved creep resistance consisting essentially of the polymeric reaction product of essentially stoichiometric amounts of a mixture of saturated aliphatic dicarboxylic acids containing a long-chain dicarboxylic acid having from 8 to 14 carbon atoms and a short-chain dicarboxylic acid having from 2 to 7 carbon atoms, the equivalents ratio of long- to short-chain dicarboxylic acids ranging from 0.5:0.5 to 0.9:0.1, and a mixture of piperazine and a polyoxyalkylene diamine of the formula ##STR3## where R is hydrogen or a methyl group and m is a positive integer such that the average molecular weight of the polyoxyalkylene diamine is between about 200 and 800, the equivalents ratio of piperazine to polyoxyalkylene diamine ranging from 0.7:0.3 to 0.95:0.05, and containing an amount up to 20 percent, based on the total amine equivalents, of an aliphatic, cycloaliphatic or aromatic amine having 2 to 10 carbon atoms, a dipiperidyl type diamine selected from the group consisting of 1,2-di(4-piperidyl)ethane, 1,3-di(4-piperidyl)propane and 1,4-di(4-piperidyl)butane or an N-substituted piperazine or dipiperidyl type diamine wherein the substituent is an aminoalkyl or hydroxyalkyl radical having from 1 to 4 carbon atoms.