摘要:
The invention relates to the use of polyurethanes having hyperbranched structures, selected from hyperbranched polyurethanes with at least one group that has an affinity to pigments and modified hyperbranched polyurethanes, as polymer dispersants for pigments. The invention is preferably further characterized in that a hyperbranched polyurethane having 2 to 100 NCO groups and a molecular weight of 500 to 50.000 g is reacted with one or more polyether derivatives.
摘要:
Trimerized isocyanates having improved solubility in polyisocyanates are prepared by reacting a polyisocyanate with a low equivalent weight polyol to form a first prepolymer, forming a cotrimer from said first prepolymer by reaction of same with diphenylmethane diisocyanate or polymeric derivatives thereof, and forming a second isocyanate terminated prepolymer by reacting said cotrimer with a second low equivalent weight polyol. The resulting cotrimer can be diluted in a polyisocyanate and used to prepare polymers, particularly polyurethane foams, having excellent properties.
摘要:
SUPERIOR FLATTENING AGENTS FOR USE IN FLATTING COMPOSITIONS WHICH PROVIDE SMOOTH TRANSPARENT FLAT COATINGS HAVING IMPROVED RESISTANCE TO WHITENING, BURNISHING AND ABRASION THAT WITHSTAND SUBJECTION TO ELEVATED TEMPERATURES WITHOUT LOSS OF FLATNESS ARE DISCRETE PARTICLES HAVING A FINE SIZE RNAGE FOR ABOUT 0.02 TO ABOUT 10 MICRONS OF A CRYSTALLINE, THERMOPLASTIC, POLAR ORGANIC POLYMER HAVING A SOFTENING POINT OF FROM ABOUT 120*C. TO ABOUT 240*C. WHICH IS INSOLUBLE IN COMMON COATING SOLVENTS FOR FILMFORMING ORGANIC BINDERS AND SOLUBLE ONLY AT ELEVATED TEMPERATURES IN STRONG ORGANIC SOLVENTS FOR ORGANIC POLYMERS.
摘要:
ADHESIVES AND COATING COMPOSITIONS COMPRISE A SOLUTION OF A HYDROXYL-TERMINATED URETHANE PREPOLYMER AND AN ISOCYANATE-TERMINATED URETHANE PREPOLYMER IN WATER.
摘要:
Solvent-free polyurethane systems particularly useful as textile laminating adhesives comprise a hydroxyl-terminated urethane prepolymer and an isocyanate-terminated urethane prepolymer.
摘要:
The present invention provides poly(ureaurethane)s including a reaction product of components comprising: (a) at least one isocyanate functional ureaurethane prepolymer comprising the reaction product of: (1) at least one isocyanate functional urethane prepolymer comprising the reaction product of: (i) a first amount of at least one polyisocyanate selected from the group consisting of polyisocyanate trimers and branched polyisocyanates, the polyisocyanate having at least three isocyanate functional groups; and (ii) a first amount of at least one aliphatic polyol; and (2) water, to form an isocyanate functional ureaurethane prepolymer; and (b) a second amount of at least one polyisocyanate and a second amount of at least one aliphatic polyol; compositions, coatings and articles made therefrom and methods of making the same.
摘要:
A photo-curable resin composition which comprises mixing urethane-acrylate resin [I], which is obtained by reacting components A and B, i.e.,Component-A: Polyisocyanates containing polybutadiene withComponent-B: Acrylate or methacrylate having a hydroxyl group in the molecule thereof anda photopolymerization initiator [II].The cured composition is suitable as an additive plating resist in the manufacture of electronic circuitry.
摘要:
This invention provides novel resin systems and high solids, solvent-based chain-extendable, self-crosslinking coating compositions comprising same. The resin systems comprises novel diblocked diisocyanate urea urethane oligomers of molecular weight about 300 to 5000. The resin system further comprises a polyepoxide, preferably a diepoxide, of molecular weight about 100 to 1000 used generally with said oligomer in weight ratio of about 1:1 to about 1:10, respectively. The resin components provide chain-extension polymerization during cure at elevated temperature, in situ, on the surface of a substrate. The resin system is also self-crosslinking. That is, no additional crosslinking component is required to cure the composition. The cured coatings of the invention provide greatly improved physical properties, in particular, greatly improved corrosion resistance.
摘要:
THIS INVENTION RELATES TO A METHOD FOR PREPARING POLYURETHANE FOAMS AND MICROCELLULAR ELASTOMERS WITH INTEGRAL SKINS WHICH ARE SUBSTANTIALLY NON-POROUS, SAID METHOD COMPRISING CONTACTING MIXTURE OF SPECIFIED POLYOLS WITH A SPECIFIED QUASI-PREPOLYMER OF TOLUENE DIISOCYANATE IN THE PRESENCE OF A BLOWING AGENT AND A CATALYST SYSTEM CONSISTING OF A TETRAALKYLGUANIDINE AND AN ORGANOMERCURY COMPOUND.