Stampable reinforced thermoplastic polyester sheets

A stampable sheet of reinforced thermoplastic material having on at least one surface of the sheet a smooth surface suitable for use as exterior automotive panels and the like, said sheet comprising:

• a plurality of layers of polymeric material and a plurality of layers of fibrous reinforcing material alternating with said layers of polymeric material, all of said layers being integrally formed together and the outer layers of said sheet being of a crystallizable material selected from poly(ethylene terephthalate), copolymers of poly(ethylene terephthalate) and blends thereof, poly(1,4-cyclohexanedimethylene terephthalate), copolymers of poly(1,4-cyclohexanedimethylene terephthalate) and blends thereof having a minimum crystallization half-time upon heating of one minute or less, the minimum crystallization half-time being that as measured with respect to each individual layer of said outer layers;
• a layer of surfacing mat of fine stranded glass of continuous filaments randomly patterned, having a weight of about 0.1 to about 0.4 oz./sq. ft., and positioned contiguously with respect to one of said outer layers of said sheet;
• and
• a layer of polymeric material positioned contiguously with the side of said surfacing layer opposite from said one of said outer layers of said sheet;
• having a shrinkage of less than about 2%, as determined in accordance with ASTM Method D-955, and a minimum crystallization half-time of one minute or less, and being selected from
• a. copolymers of poly(1,4-cyclohexylenedimethylene 1,4-cyclohexanedicarboxylate) with about 10 to about 30 mole percent dimer acid;
• b. a polyetherester comprised of
• 1. a dicarboxylic acid component comprised of
• A. 100 to 60 mole percent terephthalic acid, and
• 0 to 40 mole percent of an aliphatic or aromatic dicarboxylic acid having a molecular weight of less than 300, and
• 2. a diol component comprised of
• A. a glycol comprised of 100 to 60 mole percent tetramethylene glycol and 0 to 40 mole percent of an aliphatic or aromatic glycol having a molecular weight of less than 300, and
• B. 10 to 60 weight percent, based on the weight of the polyetherester, of a poly(alkylene oxide) glycol having 2, 3 or 4 carbon atoms in the repeating unit and having a molecular weight in the range of 400 to 5000,
• wherein the sum of the total mole percent amount of aliphatic or aromatic dicarboxylic acid having a molecular weight of less than 300 in item b.1.B, the mole percent amount of aliphatic or aromatic glycol having a molecular weight of less than 300 in item b.2.A., and the weight percent, based on the weight of the polyetherester, of the poly(alkylene oxide) glycol in item b.2.B. equals at least 25 but does not exceed 80;
• c. a polyetherester comprised of
• 1. a dicarboxylic acid component comprised of
• A. 100 to 98 mole percent terephthalic acid, and
• B. 0 to 2 mole percent of a trifunctional carboxylic acid of molecular weight less than 300;
• 2. a diol component comprised of
• A. a glycol comprised of 90 to 60 mole percent 1,4-cyclohexanedimethanol and 10 to 40 mole percent ethylene glycol or tetramethylene glycol, and
• B. 10 to 50 weight percent, based on the weight of the polyetherester, of a poly(alkylene oxide) glycol having 2 to 4 carbon atoms in the repeating unit and having a molecular weight in the range of 400 to 2000;
• d. a polyetherester comprised of
• 1. a dicarboxylic acid component comprised of
• A. 100 to 98 mole percent 1,4-cyclohexanedicarboxylic acid and
• B. 0 to 2 mole percent of a trifunctional carboxylic acid of molecular weight less than 300;
• 2. a diol component comprised of
• A. 1,4-cyclohexanedimethanol and
• B. 10 to 60 weight percent, based on the weight of the polyetherester, of a poly(alkylene oxide) glycol having 2 to 4 carbon atoms and a molecular weight in the range of 400 to 2000.