摘要:
Stable finely-divided dispersions of polyureas and/or polyhydrazodicarbonamides in a hydroxyl-group-containing material are made by reacting (i) an isocyanate with (ii) a compound selected from polyamines, hydrazines, hydrazides and mixtures thereof in the presence of (iii) a hydroxyl compound selected from polyethers, polyesters, polyester amides, polycarbonates and mixtures thereof and (iv) a catalyst. The catalyst is a compound which catalyzes the reaction of isocyanate groups with hydroxyl groups. The catalyst is used in a quantity of at least 50 parts per million parts of (i), (ii) and (iii). These dispersions are particularly useful in the production of polyurethanes.
摘要:
A process for the production of polyurethane coatings having high resistance to light, solvents, bending and abrasion. The process consists of reacting prepolymers based on cycloaliphatic and aliphatic diisocyanates in equimolar quantitative ratios with special chain extending agents in soft solvents, adding special polyisocyanates to the resulting solutions and then letting the resulting tack free coating set until crosslinking takes place.
LINEAR SEGMENTED POLYURETHANE ELASTOMERS OBTAINED BY REACTION OF NCO-PREPOLYMERS WITH CHAIN EXTENDING AGENTS IN POLAR ORGANIC SOLVENTS, AT LEAST 55 MOL PERCENT OF SAID CHAIN EXTENDING AGENTS BEING A COMPOND OF THE FORMULA
摘要:
The present invention relates to hydrophilic, i.e., water loving coatings (hereafter referred to as “WLC”). Polyurethane epoxy alkylene oxide coatings usable as coatings on for example, medical devices are a preferred WLC.
摘要:
This disclosure relates to the use of carboxylic acid hydrazide for de-bonding (e.g., detaching) polyurethane adhesives. The carboxylic acid hydrazide is present in the polyurethane adhesive as a solid in free form and is thus not incorporated in the polymer. When the adhesive is heated to a temperature of at least 80° C., the polymer is thermally degraded. With such an adhesive, components that are bonded in such a way can be detached in a simple method, by which the repair, the use or the recycling of the components is more easily possible.
摘要:
The present invention pertains to aqueous polyurethane-polyurea dispersions which are prepared by the acetone process using methyl acetate instead of ketones and are chain-extended using hydrazine or derivatives thereof, these dispersions having an improved stability towards thermal yellowing and a relatively low residual hydrazine/hydrazine derivative content.
摘要:
Compressible substrates coated with a coating comprising an aqueous polyurethane resin having a hydroxyl number of less than 10 and a colorant are disclosed. Footwear and footwear components comprising compressible substrates coated with an aqueous polyurethane resin having a hydroxyl number of less than 10 and a colorant are also disclosed.
摘要:
Color harmonization is provided for articles of manufacture comprising different substrate materials. A coating composition is selected that can be applied to the different substrate materials while maintaining substantially uniform visual characteristics of the article. The substrates may include flexible materials such as natural leather, synthetic leather, vinyl, foam, textiles and the like. Examples of articles of manufacture include footwear, automotive upholstery and automotive interiors.
摘要:
The present invention provides a crosslinkable waterborne coating composition useful for providing protective coating to wood and other substrates. The coating composition includes a vinyl addition latex polymer having a first crosslinkable functional group and a polyurethane dispersion having a second crosslinkable functional end group. The coating composition is preferably essentially formaldehyde free.