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 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.
摘要:
Disclosed are compositions comprising a copolyester of(A) at least one aromatic or saturated aliphatic or cycloaliphatic dibasic acid having 4 to 36 carbon atoms,(B) from about 2 to about 40%, based on the weight of the copolyester, of a carboxylated polyolefin selected from the group consisting of (1) oxidized polyolefins and (2) the reaction product of(a) at least one homo or copolymer of an .alpha.- olefin having from 2 to 10 carbon atoms and(b) at least one unsaturated acid or anhydride having from 3 to 5 carbon atoms or a 1 to 10 carbon atom alkyl ester thereof, and(C) at least one saturated aliphatic or cycloaliphatic glycol having from 2 to 12 carbon atoms,the copolyester having a crystalline melting point of about 70.degree.-200.degree. C. and an I.V. of about 0.2-1.6. These compositions are especially useful as coatings and adhesives.
摘要:
Amorphous copolyesters containing residues derived from 2,2′-[2,2-](sulfonylbis(4,1-phenyleneoxy))bis(ethanol). They exhibit enhanced heat distortion temperatures and glass transition temperatures without a significant increase in viscosity at low shear rates. The amorphous copolyesters also have improved resistance to attack by lipid solutions and are readily molded and extruded to form medial devices such as connectors, tubes, etc. which are useful for transport of lipids and other medical solutions.
摘要:
An amorphous copolyester having a maximum melt viscosity at 1 radian/second and at about 260 to about 290° C. of about 12000 poise, a glass transition temperature ranging from about 88° C. to about 120° C., and an inherent viscosity of at least about 0.6 dl/g. The amorphous copolyesters comprise the reaction product of a diol component and a dicarboxylic acid component. The diol component comprises residues of from about 5.0 to about 50 mole % of 2,2′-(sulfonylbis (4,1-phenyleneoxy))-bis(ethanol) which has the following chemical formula: and from about 50 to about 95 mole % of a mixture of at least two diols selected from the group consisting of ethylene glycol, neopentyl glycol, 1,3-propanediol, 1,4-butanediol, 1,4-cyclohexanedimethanol, and mixture thereof. The dicarboxylic acid component comprises residues of terephthalic acid, isophthalic acid, 1,4-cyclohexandedicarboxylic acid, 2,6-naphthalene dicarboxylic acid and mixtures thereof. The amorphous copolyesters according to the invention have relatively low melt viscosities and relatively high glass transition temperatures. Because of the low melt viscosities and high glass transition temperatures, copolyesters with increased IV or molecular weight can easily be obtained. The copolyesters according to the invention can be used for molded or extruded articles, sheets, and films. Accordingly, the invention also relates to molded and extruded articles, sheets, and films made from a copolyester as described above. Additionally, articles, sheets, and films 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, as well as other oxygen sensitive products such as inks and adhesives.