摘要:
Articles having reduced thrombogenicity when in contact with blood products containing albumin and methods of their use are provided. The articles comprise at the surface of blood contact a water insoluble polymeric substrate material having covalently attached thereon aliphatic extensions of 14 to 20 carbon units. When exposed to blood the aliphatic chain extensions provide a hydrophobic binding site for albumin. The articles when implemented with whole blood or blood products selectively enhance albumin affinity binding to the exclusion of other blood components, and subsequently minimize thrombus formation.
摘要:
Disclosed is a method for reducing the odor and/or improving the performance of polyester plasticizers of the type made from a dibasic acid, a polyol, and a chain terminator wherein a molar excess of alcohol ingredients is used. Such improved polyester plasticizer is made by subjecting the polyester plasticizer to a second stage reaction with a treating agent reactive with hydroxyl groups to reduce the hydroxyl value to no more than about 4. Preferably, the low acid number of the initial polyester plasticizer is maintained. The treating agent can be monofunctional or poly-functional, though preferably a difunctional isocyanate is used. Conventional thermoplastic substrates, typified by polyvinyl chloride, can be plasticized with the novel polyester plasticizers of the present invention.
摘要:
A modified polyethylene terephthalate molding material containing terephthalic acid as a major dicarboxylic acid component and ethylene glycol as a major glycol component, which contains 0.1 to 15 mol %, based on the total amount of said glycol component present, of 2-methyl-1,3-propanediol as part of said glycol component.
摘要:
A process is provided for deactivation of catalyst residues in polyester compositions. The polyester compositions are provided by polymerizing diols and diacids, or mixtures of such diols and diacids, to form polyester compositions. The polymerization is carried out in the presence of a polymerization catalyst that leaves traces of such catalyst residues in the polyester composition. These catalyst residues can adversely affect the further processing and end use of the polyester composition. The present process provides deactivation of the catalyst residues by the use of a combination of a mono- or dihydrogen phosphonate or mono-, di-, or trihydrogen phosphate compound and a di- or triester phosphonate compound or a phosphite compound.
摘要:
High molecular weight linear condensation polyesters are stabilized against deterioration by heat with a stabilizer comprising an N-epoxyalkyl imide of a dicarboxylic acid, having 5 to 20 carbon atoms in the imide molecule and composed of carbon, hydrogen, carbonyl and epoxy oxygen, and imide nitrogen atoms, said epoxy oxygen being linked to adjacent carbon atoms.
摘要:
The disperse dyeability of a fiber or film forming polyester resin is improved by dispersing substantially uniformly in a polyester resin in which it is at least partially soluble a compound having the formula ##STR1## wherein R is benzyl or phenethyl, R.sub.1 is ethylene or propylene, R.sub.2 is hydrogen or lower alkyl and M is an alkali metal.
摘要:
A durably antistatic polyester composition comprising a polyethylene terephthalate-based polyester and an antistatic agent including a phosphorous acid triester derivative therein containing a polyalkylene oxide chain in the molecule.
摘要:
Easily dyeable polyester fiber consisting of a copolyester having 80 to 98 mole % of ethylene terephthalate units, and having a degree of crystallinity (X.sub.c) and a birefringence (.DELTA.n) satisfying the following relationship (1), and a peak temperature (T.sub.max) at which the dynamic loss tangent (tan .delta.) measured at a frequency of 110 Hz becomes maximum and a maximum tan .delta. value (tan .delta.).sub.max within the following ranges (2) and (3):X.sub.c (%)
摘要翻译:由具有80〜98摩尔%的对苯二甲酸乙二醇酯单元,具有满足以下关系式(1)的结晶度(Xc)和双折射率(DELTA n)的共聚酯和峰值温度(Tmax)组成的容易染色的聚酯纤维, 在其中以110Hz的频率测量的动态损耗角正切(tanδ)变为最大,并且在以下范围(2)和(3)内的最大tanδ值(tanδ)max:Xc(%)< - 710x DELTA n + 110(1)90℃
摘要:
The invention relates to a process for purifying polyphenylene oxides obtained by interruption of the copper-amine catalyzed polycondensation of di-ortho-substituted phenols, where in said process the reaction mixture is subjected to a "reaction-extraction" (i.e., an extraction which is accompanied by reaction) with water or stream, at a temperature of 60.degree. to 150.degree. C. It is particularly advantageous if the starting mixture in the inventive process comprises a solution of the polyphenylene oxide wherein the reaction has been interrupted by water and CO.sub.2, which solution is mixed into a toluene/water mixture; and further if the "reaction-extraction" is carried out in the presence of an alkanolamine and a stabilizer.
摘要:
A polyester polymer powdered paint comprising a thermoplastic polyethylene iso-terephthalate copolymer containing from 8 to 20 mol % of isophthalic acid component and having an intrinsic viscosity of from 0.7 to 1.0.