摘要:
Biodegradable compositions containing an aliphatic-aromatic copolyester. Methods of making the compositions and articles made from the compositions.
摘要:
A method for preparing high shrinkage PTT copolyester, comprising: adding starting raw materials into a reaction kettle and adding an esterification catalyst to carry out esterification reaction at 220° C.˜260° C. under 0.05˜0.30 MPa and completing the reaction when there being no water produced: adding polymerization catalyst into the reaction system and carrying out the polymerization reaction at 240° C.˜280°C. to get polytrimethylene terephthalate. The starting raw materials consists of 1,3-propylene glycol, terephtalic acid, a third monomer, a fourth monomer and a fifth monomer. The third monomer is selected from the group consisting of non-para aromatic dicarboxylic acid, 1,4-cyclohexane diformic acid and glutaric acid; The fourth monomer is selected from the group consisting of C3-C10 branched aliphatic dihydric alcohol, 1,4-cyclohexanedimethanol, diethylene glycol and triethyleneglycol; The fifth monomer is aliphatic polyalcohols which has carbon number between 3 and 10 and hydroxyl number per molecule is more than or equal to 3, or trimellitic anhydride, amount of the 1,3-propylene glycol, terephthalic acid, third monomer, fourth monomer and fifth monomer are such used in a molar ratio of carboxyl to hydroxyl is 1:1.16˜-1.85, wherein the amount of the third monomer used is 5%-10.5% of the total weight of the starting raw materials, the amount of the fourth monomer used is 0.05%-1.0% of the total weight of the starting raw materials, and the amount of the fifth monomer used is 50 ppm-600 ppm, based on the total weight of the starting raw materials. Polytrimethylene terephthalate prepared by the invention shows good spinning behaviour, of which the crystallization speed is noticeably lower than that of conventional polytrimethylene terephthalate, thus, fibers made of them has high boiling water shrinkage rate and ideal shrink property.
摘要:
The present invention provides a method of producing D-type lactide from liquid D-type lactic acid, and a method for producing D-type polylactic acid having a weight average molecular weight of about 50,000˜20,000 g/mol from the produced D-type lactide. The method of the present invention is advantageous in that D-type lactide can be obtained at a high yield by a simple method, compared to the conventional production methods. Consequently, production cost of D-type polylactic acid that is finally obtained from D-type lactide can be reduced.
摘要:
Disclosed is a method for manufacturing D-lactide from liquid D-lactic acid and a method for manufacturing D-polylactic acid with a weight-average molecular weight 50,000-20,000 g/mol from the prepared D-lactide. The disclosed method is advantageous in that D-lactide can be prepared in high yield through a relatively simple process as compared to the existing method. Thus, the cost for producing D-polylactic acid from the D-lactide can be reduced.
摘要:
Polyester compositions, especially polyethylene terephthalate homopolymer and copolymers, are disclosed containing titanium catalysts and catalyst deactivator added late in the manufacturing processing having reduced acetaldehyde generation rates. The polyester compositions are low in free acetaldehyde, making them suitable for fabrication into beverage containers for relatively tasteless beverages such as bottle water. Furthermore, the polyesters are polymerized to a high inherent viscosity in reduced processing time, without the necessity of further polymerization in the solid state, and in the absence of acetaldehyde scavengers leading to polyester polymers having reduced color.
摘要:
A method for producing a polyester resin composition C), which comprises melt-kneading a polyester resin (A) which satisfies the following formulae (1), (2) and (3) and a polyester resin (B) which satisfies the following formula (4): P1≧10 (1) 0.1≦Ge1≦1.5 (2) 0.001≦Ge1/P1≦0.15 (3) 0≦P2/Ti1≦80 (4) provided that in the formulae (1), (2) and (3), P1 is the content (mol) of phosphorus atoms and Ge1 is the content (mol) of germanium atoms, per ton of the polyester resin (A), and in the formula (4), P2 is the content (mol) of phosphorus atoms and Ti1 is the content (mol) of titanium atoms, per ton of the polyester resin (B). A polyester resin composition (C) obtained by the method, and a molded product such as a film made from such a composition are also provided.
摘要:
Disclosed is a catalyst compound for preparing a polyester resin. Provided are a novel catalyst compound for preparing a polyester resin, a polyester resin prepared using the compound and a container molded using the resin. The polyester resin is nontoxic, is environmentally friendly and exhibits high intrinsic viscosity and superior colors L and b, thus solving reaction speed during solid state polymerization and a yellowing phenomenon, problems associated with use of conventional titanium catalysts.
摘要:
Disclosed is a method for increasing the solid state polymerization (SSP) rates of metal catalyzed polyesters. The method comprises in a first step, reacting a dicarboxylic acid or a C1-C4 dicarboxylic diester with a diol at a suitable temperature and pressure to effect esterification or transesterification to prepare a precondensate and in a second step, reacting the precondensate to effect polycondensation at a suitable temperature and pressure to prepare a high molecular weight polyester and in a third step, further increasing the molecular weight and viscosity of the polyester under SSP conditions of a suitable temperature and pressure, where a metal catalyst is added in the first step or in the second step as a reaction catalyst, and where a certain phosphinic acid compound is added in the first step, in the second step or just prior to the third step. The polyester product exhibits low aldehyde formation during melt processing steps as well as excellent color.
摘要:
Provided are a polyester polymerization catalyst with which the generation of foreign materials caused by the catalyst or mold pollution at the time of molding are reduced and polyesters having remarkably superior thermal stability and color tone can be obtained.Provided is a polyester polymerization catalyst produced by the reaction of a titanium compound and a mannitol in a molar ratio of titanium atom to mannitol of from 1:1 to 1:3. A method for producing a polyester employs the polyester polymerization catalyst.
摘要:
The present invention relates to metal/organic complexes of Formula (I), (II), (III), (IV), (V) and (VI) that are useful as catalysts for the polymerisation of carbonyl-containing or cyclic monomers. Typical polymerisation reactions are, for example, those of lactides. R is independently selected at each occurrence from the group comprising: hydrogen, hydrocarbyl and substituted hydrocarbyl, M is a Lewis-acidic metal, and, if present, X is any suitable counter ion.