摘要:
There is provided an oligomeric polyol composition having (a) an oligomeric network containing residues of at least one polyhydroxylated aromatic compound and residues of at least one polyol having at least three hydroxyl groups; and (b) a plurality of peripheral groups having one or more pendant hydroxyl groups bound to the oligomeric network by a plurality of linking units. The residues of the polyol may optionally contain one or more oxygen ether groups, one or more amino ether groups, or both of one or more oxygen ether groups and one or more amino ether groups. Reaction of the oligomeric polyols with isocyanate monomers affords a new class of polyurethanes having superior heat and water resistance. The new polyurethanes exhibit lower peak exotherms, typically less than 250° F. during in-mold polymerization. Articles prepared from polyurethanes incorporating such oligomeric polyol compositions exhibit flexural strengths and moduli in excess of 10,000 psi and 400,000 psi respectively, and outstanding green strength.
摘要:
A coating composition is based on a polyester mixed with an alkyl-etherified melamine formaldehyde. The coating composition is partially cured in a first stage to provide a thermoformable partially cured, tack-free, non-blocking, coating layer, followed by application to generally a contoured substrate and thermoforming to conform thereto. The contoured partially cured coating layer is then heat cured to form a cured coating. A hydroxyl-terminated polyoxetane containing repeat units derived from oxetane monomers having one or two pendent —CH2—O—(CH2)n—Rf groups, wherein Rf is partially or fully fluorinated, can be esterified with polyester-forming reactants to form a fluorinated polyoxetane-modified polyester.
摘要:
A substrate having an adherent and stain resistant layer having durability and flexibility, said layer comprising the reaction product of a reactive polyester having free carboxylic acid and/or hydroxyl groups, a hydroxyl terminated polymer including repeat units from an oxetane having pendant nullCH2nullOnull(CH2)nnullRf groups (said Rf groups generally being a fluorinated alkyl group) and an amino resin curative. The substrate may be printed or embossed or both. The coated substrate has both stain resistant properties and dry erase properties with dry erase markers. The coated substrate can be used as prepared or applied to other substrates.
摘要:
This invention relates to a process for the preparation of non-cellular or cellular polyurethane elastomers by the reaction of(a) an organic polyisocyanate, preferably in the form of NCO groups containing prepolymers and/or modified urethane group containing organic polyisocyanates with(b) a higher molecular weight compound having at least two reactive hydrogen atoms,(c) a polyester polyol containing tin and/or titanium compounds as catalysts, and optionally(d) a chain extending agent and/or crosslinking agent in the presence of(e) blowing agents,(f) auxiliaries and/or additiveswhereby from 0.1 to 10 parts by weight, based on 100 parts by weight of the (b) component, of a polyester polyol is used as a catalyst, which is prepared by the polycondensation of organic polycarboxylic acid with multivalent alcohols in the presence of from 0.002 to 5 weight percent, based on the weight of the polycondensation mixture, of a titanium and/or tin compound used as a catalyst at temperatures from 150.degree. to 200.degree. C., as well as using this catalyst in the preparation of plastics using the polyisocyanate addition polymerization process, preferably for preparing polyurethane-plastics.
摘要:
Disclosed are polyol compositions with a low viscosity that exhibit superior heat resistance, enhanced stability in the presence of water, improved strength, hardness, and molding characteristics relative to known polyurethane materials. Disclosed is a polyol composition comprising: (a) at least one monomeric polyol comprising three or more hydroxyl groups; (b) at least one higher polyol comprising three or more hydroxyl groups; and (c) at least one polyhydroxylated aromatic compound; wherein the at least one higher polyol comprises residues of either or both of the at least one monomeric polyol and the polyhydroxylated aromatic compound linked by one or more carbonate groups, oxygen ether groups, or a combination thereof. Disclosed are methods of preparing the disclosed compositions. Disclosed are articles prepared from the disclosed compositions that exhibit flexural strengths in excess of 10,000 psi and flexural moduli in excess of 400,000 psi, and exhibit outstanding green strength.
摘要:
A composition in the form of an aqueous dispersion used in cosmetic applications is provided. The composition comprises at least one polyurethane-urea polymer that is functionalized with at least one hydrolyzed or hydrolyzable silyl group. When the composition is used in hair care, it does not have a reshapable effect.
摘要:
Difficult-to-bond substrates possessing low surface energies are bonded with moisture curable polyurethane hot melt adhesive comprising a polyurethane prepolymer which is the reaction product of a polyol component and a polyisocyanate component, wherein said polyol component comprises a polyester polyol which is the reaction product of diacid comprising aromatic diacid and optional co-monomer diacid and diol, with the proviso that said diacid is substantially free of phthalic acid or derivatives thereof.
摘要:
A method of manufacturing a modified polyhydroxy compound, which is characterized in that a polyhydroxy compound is heated for 30 minutes or more at a temperature ranging from 150.degree. to 250.degree. C. under stirring and in the presence of tin, tin compounds such as tin halogenide, tin hydroxide and tin oxide. The polyhydroxy compound modified by this method is effective in improving the foamability and mechanical strength of urethane foam, when it is used as a raw material in the manufacture of urethane foam.
摘要:
A compound having the molecular formula: ##EQU1## wherein, M is selected from the group consisting of pentavalent atoms of Group V of the Periodic Table; R.sub.1, R.sub.2 and R.sub.3 are selected from the group consisting of substituent groups bondable to M; X is an electron withdrawing group; A is a connecting group capable of undergoing either condensation or addition reactions with compatible function groups of other compounds; R.sub.4 is an optional connecting group between the X and A groups; B is selected from the group consisting of R.sub.1, R.sub.2, R.sub.3, O--X--R.sub.4).sub.n A and O--X--R.sub.5, and wherein R.sub.5 is selected from the group consisting of R.sub.1, R.sub.2 and R.sub.3 ; and n is the integer 0 or 1. These pentavalent atom-containing compositions may be reacted into polymers with monomers, prepolymers or polymers. The compositions and polymers have flame-retardant properties.