摘要:
A shrinkable copolyester film having shrinkage of not less than 30% in either the machine direction or transverse direction after specific heat treatment. The shrinkable copolyester film of the present invention is excellent in shrinkage properties and is substantially free from wrinkles, and uneven shrinkage. The copolyester is useful as a shrinkage label for PET bottles.
摘要:
The present invention relates to a process for preparing poly(ethylene-2,6-naphthalene dicarboxylate) polymers wherein a low concentrations of an alkali metal salt is present. More specifically, 15 ppm to 100 ppm of an alkali metal derived from an alkali metal salt is added in the melt polymerization reaction mixture during formation of such polymers. The polymers are useful in applications where improved hydrolytic stability at elevated temperatures and high humidity (>50% relative humidity) are required.
摘要:
Poly(tetramethylene terephthalate) modified with an aliphatic dicarboxylic acid having 4-12 carbon atoms and either dimer acid or dimer glycol. This copolyester is blow moldable and is found to have improved resistance to gamma radiation.
摘要:
Disclosed are novel copolyester materials having improved weatherability and useful, for example, as films, fibers, sheeting and the like in outdoor applications where long and daily exposure to actinic radiation is encountered. These copolyesters comprise, for example, polyethylene terephthalate containing a total of from about 0.3 to about 5.0%, preferably from about 0.6 to about 2.0% by weight of one or more moieties having the formula ##STR1## where R.sub.1 is cyano, alkylcarbonyl, cycloalkylcarbonyl or arylcarbonyl; R.sub.2 and R.sub.3 are, for example, alkyl, cycloalkyl, or aryl which may be substituted with a large variety of groups; and --X-- is ortho, meta, or para to the -ylene linkage and is selected from groups of the formulae ##STR2## wherein R is alkylene of 1-10 carbons, aryl, or cycloalkyl, each of which may be substituted.
摘要:
Disclosed is a textile fiber comprised of a poly(oxyethylene)-glycol modified poly(1,4-cyclohexylenedimethylene terephthalate) type polyester containing phosphorus, a stabilizer, an organic titanium compound, and optionally a manganous ion. The fiber exhibits an unobvious combination of commercially acceptable mechanical properties, commercially acceptable lightfastness, commercially acceptable gasfastness, and commercially acceptable dye rate.
摘要:
The invention relates to a copolyester having an inherent viscosity ranging from about 0.4 to about 1.4 and a cold crystallization temperature ranging from about 120 to about 160.degree. C. Such copolyesters comprise the reaction product of a glycol component comprising from about 85 to about 100 mole % of 1,3-propanediol, a dibasic acid component comprising from about 85 to about 100 mole % of a dibasic acid selected from terephthalic acid, napthalenedicarboxylic acid, anhydrides, acid chlorides, and lower alkyl esters thereof, and mixtures thereof, and from about 5 to about 15 mole % of a comonomer. The presence of the comonomer lowers the crystallization temperature of the copolyesters according to the invention such that amorphous preforms can be easily molded from the copolyesters. Such amorphous preforms are readily stretch blow molded into bottles or other container shapes or may be injection molded into various shapes or objects or extruded into film or sheeting. Accordingly, in another embodiment of the invention relates to film and containers prepared from the copolyester composition described above. The films and containers according to the invention have improved gas barrier properties such that they may be used for packaging perishable goods, such as beverages, foods, and cosmetics.
摘要:
Disclosed are orientable, heat setable, semi-crystalline copolyesters which have high glass transition temperatures. These copolyesters have high heat distortion temperatures along with excellent molding and film properties which makes them useful in packaging materials and molded parts. These copolyesters have repeat units from about 100 mol % 1,4-cyclohexanedimethanol, about 1-99 mol % terephthalic acid and about 99-1 mol % naphthalene dicarboxylic acid.
摘要:
Disclosed are foamable copolyester compositions containing 0.5 to 5.0 mole percent of a dicarboxylic acid sulfomonomer which contains at least one metal sulfonate group attached to an aromatic nucleus. These copolyesters possess high melt viscosity and are readily foamable with a wide range of foaming agents to provide low density shaped articles, films, and sheets.
摘要:
This invention relates to a method of preparing poly(ethylene 2,6-naphthalene dicarboxylate) by the polycondensation reaction of ethylene glycol and dimethyl-2,6-naphthalene dicarboxylate, using a dimethyl-2,6-naphthalene dicarboxylate starting material which contains significant amounts of methyl hydrogen 2,6-naphthalene dicarboxylate as a contaminant. The methyl hydrogen 2,6-naphthalene dicarboxylate moiety is incorporated into the polymer structure by initially esterifying the methyl hydrogen 2,6-naphthalene dicarboxylate acid end-group with ethylene carbonate, in the presence of an amine or ammonium catalyst, before the polyesterification/polycondensation reaction is performed.
摘要:
Disclosed are heat-resistant adhesive compositions comprising a copolyester derived from terephthalic acid, from about 30 to about 50 mol % diethylene glycol, and at least 50 mol % ethylene glycol, the polyester having an inherent viscosity of from about 0.4 to about 1.0. The composition is especially useful in bonding parts of ovenable food containers.