Laminates containing coextruded scrap
First Claim
1. A continuous plastic laminate comprising at least three melt coextruded sheets, each sheet comprising at least one thermoplastic polymer, the outside sheets having a higher stiffness at use temperature than at least one inside sheet, said inside sheet comprising laminate scrap derived from the production of said laminate comprising a blend of a thermoplastic polymer A and thermoplastic polymer B, thermoplastic polymer A having a higher glass transition temperature than thermoplastic polymer B and said outside sheets comprising thermoplastic polymer A, wherein said thermoplastic polymers are selected from the group consisting of one or more of the following:
- a polyrylethersulfone, a poly(aryl ether), a polyarylate, a polyetherimide, a polyester, an aromatic polycarbonate, a styrene resin, a poly(alkyl acrylate), a polyhydroxyether, a polyamide, a poly(arylene sulfide), a crystalline polyolefin, and a polyphenylene oxide;
said laminate comprising the following;
space="preserve" listing-type="equation">A/ABA/B/A,
space="preserve" listing-type="equation">A/B/ABA/A,
space="preserve" listing-type="equation">A/ABA/B/ABA/A,
space="preserve" listing-type="equation">AABA/B/A,
space="preserve" listing-type="equation">A/B/AABA,
space="preserve" listing-type="equation">AABA/B/AABA,
space="preserve" listing-type="equation">A/ABAB/A,
space="preserve" listing-type="equation">AABA/ABAB/A,
space="preserve" listing-type="equation">A/ABAB/AABA, or
space="preserve" listing-type="equation">AABA/ABAB/AABA.
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Abstract
A continuous plastic laminate having improved stiffness at use temperature, comprising at least three melt coextruded sheets, each comprising a thermoplastic polymer or polymer blend, the outside sheets having a higher stiffness at use temperature than at least one inside sheet.
wherein said continuous laminate laminate scrap derived from the production of said laminate, said scrap being incorporated therein by melt coextruding said scrap as at least one additional discrete inside layer or by melt coextruding said scrap as part of at least one of said melt coextruded sheets,
whereby the stiffness at use temperature of said scrap-containing laminate is increased relative to a plastic laminate identical thereto except for the incorporation of said scrap, and
wherein said thermoplastic polymer or polymer blend comprises a polyarylethersulfone, a poly(aryl ether), a polyarylate, a polyetherimide, a polyester, an aromatic polycarbonate, a styrene resin, a poly(alkyl), a polyhydroxyether, a polyamide, a poly(arylene sulfide), a crystalline polyolefin, a polyphenylene oxide, or blends thereof.
75 Citations
39 Claims
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1. A continuous plastic laminate comprising at least three melt coextruded sheets, each sheet comprising at least one thermoplastic polymer, the outside sheets having a higher stiffness at use temperature than at least one inside sheet, said inside sheet comprising laminate scrap derived from the production of said laminate comprising a blend of a thermoplastic polymer A and thermoplastic polymer B, thermoplastic polymer A having a higher glass transition temperature than thermoplastic polymer B and said outside sheets comprising thermoplastic polymer A, wherein said thermoplastic polymers are selected from the group consisting of one or more of the following:
- a polyrylethersulfone, a poly(aryl ether), a polyarylate, a polyetherimide, a polyester, an aromatic polycarbonate, a styrene resin, a poly(alkyl acrylate), a polyhydroxyether, a polyamide, a poly(arylene sulfide), a crystalline polyolefin, and a polyphenylene oxide;
said laminate comprising the following;
space="preserve" listing-type="equation">A/ABA/B/A,
space="preserve" listing-type="equation">A/B/ABA/A,
space="preserve" listing-type="equation">A/ABA/B/ABA/A,
space="preserve" listing-type="equation">AABA/B/A,
space="preserve" listing-type="equation">A/B/AABA,
space="preserve" listing-type="equation">AABA/B/AABA,
space="preserve" listing-type="equation">A/ABAB/A,
space="preserve" listing-type="equation">AABA/ABAB/A,
space="preserve" listing-type="equation">A/ABAB/AABA, or
space="preserve" listing-type="equation">AABA/ABAB/AABA. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39)
- a polyrylethersulfone, a poly(aryl ether), a polyarylate, a polyetherimide, a polyester, an aromatic polycarbonate, a styrene resin, a poly(alkyl acrylate), a polyhydroxyether, a polyamide, a poly(arylene sulfide), a crystalline polyolefin, and a polyphenylene oxide;
Specification