摘要:
A method for producing of a polybutylene terephthalate by reacting a dicarboxylic acid component containing terephthalic acid as a main constituent directly with a glycol component containing 1,4-butanediol as a main constituent to form an esterification reaction product and subjecting the esterification reaction product to a polycondensation reaction, characterized in that 0.4 to 1.3 mole of 1,4-butanediol per mole of terephthalic acid is added in the presence of an esterification catalyst which is at least one member selected from the group consisting of titanium compounds and tin compounds, to start said esterification reaction and thereafter a required amount of 1,4-butanediol is supplied additionally to complete the esterification reaction.
摘要:
A polyethylene terephthalate polycondensation catalyst system comprises from about 2 parts to about 18 parts of catalyst metal in the form of an alkyl titanate and from about 40 parts to about 300 parts of catalyst metal in the form of an antimony compound, each of said metals being per million parts of polymer product.
摘要:
MANUFACTURE OF LINEAR POLYESTERS OF POLYBUTYLENE TEREPHTHALATES CONTAINING AT LEAST 80% MOLAR OF BUTYLENE TEREPHTHALATE UNITS USING SPECFIC CATALYSTS CONSISTING OF TITANIUM COMPOUNDS PRODUCED FROM TITANIUM DIOXIDE, A-HYDROXY CARBOXYLIC ACIDS AND TERTIARY AMINES. THE POLYESTERS ARE SUITABLE FOR THE MANUFACTURE OF FILAMENTS, FIBERS SHEETING AND INJECTION MOLDED ARTICLES.
摘要:
A process for continuous production of high molecular polybutyleneterephthalate by direct esterification of terephthalic acid and 1,4 butanediol in the presence of tin- or titanium-containing catalysts at preferred temperatures of 235.degree. to 250.degree. C., and preferred pressures of 0.3 to 0.6 bar during the first stage--with minimal formation of tetrahydrofurane--followed by precondensation and polycondensation at reduced pressure.
摘要:
Specific color imparting compounds, including colorants and catalysts are used to produce a polyester resin having an amber color. The compounds are added during the preparation of the polymer and the resins produced can be utilized to make various containers or packages to hold liquids or solids.
摘要:
A process for manufacturing a colorless polyetheresteramide, which comprises the step of reacting (A) a polyamide-forming compound selected from aminocarboxylic acids and lactams each having at least 10 carbon atoms, (B) a dicarboxylic acid having from 4 to 20 carbon atoms and (D) a polyoxyalkylene glycol having an average molecular weight of from 300 to 6,000, in the molten state, in the presence of 0.0001 to 0.00999 percent by weight, based on the total weight of the above mentioned reactants, of a tetraalkyl titanate having a straight or branched alkyl having 1 to 24 carbon atoms, at a pressure of at the highest 5 mmHg at a temperature of 200.degree. to 300.degree. C.
摘要:
Poly(alkylene dicarboxylates) such as poly(alkylene terephthalates) are prepared by reacting a dicarboxylic acid or alkyl ester thereof with an alkanediol in the presence of a titanium-containing chelate compound which may be prepared by the reaction of a tetraalkyl titanate with an ortho-disubstituted hydroxyaromatic compound of the formula ##STR1## wherein X.sup.1 is hydrogen, lower alkyl or lower aryl. Polymerization by this method minimizes ester-carbonate interchange in blends of the poly(alkylene dicarboxylates) with aromatic polycarbonates. The chelates in which X.sup.1 is lower alkyl or lower aryl are novel compounds.
摘要:
In the two stage reaction of terephthalic acid with 1,4-butanediol to produce polybutylene terephthalate in which acid and diol are first subjected to catalytic esterification/oligomerization and the resulting products are thereafter subjected to catalytic polycondensation, the co-production of tetrahydrofuran is significantly reduced by conducting the polycondensation reaction prior to completion of the esterification/oligomerization reaction.
摘要:
An olefinically unsaturated alkyl carboxylate is reacted with hydrogen sulfide in the presence of a lower alkanol using an addition catalyst with water and/or sulfur cocatalyst to give an alkyl mercaptocarboxylate/dialkyl thiodicarboxylate mixture having a high proportion of the mercaptocarboxylate. If sulfur is contained in the cocatalyst, dialkyl dithiodicarboxylates are also formed. The resulting mixture on transesterification with a poly(oxyalkylene)-polyol gives a poly(oxyalkylene)-polyester-poly(monosulfide)-polythiol or a poly(oxyalkylene)-polyester-poly(monosulfide)-poly(disulfide)-polythiol having a good balance of properties.
摘要:
Using an alkanolamine titanium chelate catalyst, such as triethanolamine titanium chelate, in small catalytic amounts to esterify and polycondense aromatic polycarboxylic acids or anhydrides, such as terephthalic acid, with a glycol, such as ethylene glycol at low glycol to acid reactant ratios surprisingly yields a polyester of low diethylene glycol content without adding an additional diethylene glycol suppressant.