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Laminates with adhesive layers of fire retardant, melt stable ethylene/carboxylic acid copolymer compositions
| Details |
Inventors: Feinberg, Stewart C.;
Assignee: E. I. Du Pont de Nemours and Company (Wilmington, DE)
Primary Examiner: Cannon; James C.
Assistant Examiner:
Attorney, Agent or Firm:
A laminated structure comprising at least two non-adhesive layers and at least one adhesive layer wherein the adhesive layer is made of a composition stabilized against thermal crosslinking and consequent reduction of its melt index, comprising a uniform dispersion of antimony oxide in a blend of a matrix polymer which is a dipolymer of ethylene with an ethylenically unsaturated carboxylic acid or a terpolymer of ethylene with an ethylenically unsaturated carboxylic acid and with another ethylenically unsaturated comonomer, carbon dioxide or sulfur dioxide; and organo-halogen fire-retardant; and a stabilizing polymer which is a high melt index copolymer of ethylene with acrylic or methacrylic acid. Such laminated structures include laminates used in packaging and building construction. |
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DETAILED DESCRIPTION The matrix polymer useful herein is a copolymer represented by the formula E/X/Y, where E is ethylene; X is a C.
sub.
3 -C.
sub.
7 alpha, beta-unsaturated carboxylic acid or mixtures of such acids; and Y, which is optional, is a copolymerizable comonomer or a mixture of other copolymerizable comonomers selected from the group consisting of C.
sub.
1 -C.
sub.
10 alkyl esters of C.
sub.
3 -C.
sub.
7 alpha, beta-unsaturated carboxylic acids, vinyl esters, vinyl ethers, acrylonitrile, methacrylonitrile, carbon monoxide, and sulfur dioxide; wherein the respective relative weight ratios of the monomers in said E/X/Y copolymer is about 96:4:0 to 40:30:30, and the melt index of said copolymer, determined according to ASTM D1238, Condition E, is about 0.
1-100 dg/min.
Preferred matrix dipolymers are dipolymers of ethylene with methacrylic acid (X is methacrylic acid and Y is absent) and especially those in which the weight proportion of methacrylic acid is about 3-30%, preferably 4-15% by weight.
Preferred matrix terpolymers are terpolymers of ethylene in which X is methacrylic acid and Y is vinyl acetate, n-butyl acrylate, or isobutyl acrylate.
The stabilizing polymer useful herein (also referred to herein as acid wax) is a high melt index copolymer of ethylene with an unsaturated carboxylic acid selected from the group consisting of acrylic acid (E/AA copolymer) and methacrylic acid (E/MAA copolymer), said high melt index copolymer having a melt index of at least about 5,000 dg/min, preferably at least 10,000 dg/min, determined according to ASTM D1238, condition E, and containing at least about 5 weight percent, preferably at least 9 weight percent, of carboxylic acid monomer.
A minor amount of third monomer such as those described above for the matrix polymer can be present provided the appropriate M.
I.
level is retained.
It is generally preferred to choose the type and amount of the stabilizing polymer such that the resulting initial melt index of the composition is close to the melt index of the matrix polymer itself
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