摘要:
The invention is related to an adhesive comprising a stable, fine particle size aqueous dispersion of polyurethane-urea which is the reaction product of an isocyanate-terminated prepolymer with an amine-containing chain extending agent which is characterized in that the functionality of said agent is about 2.05 to about 2.50. The adhesive was surprisingly and unexpectedly found to exhibit an increased softening point temperature as compared to the corresponding temperature of related adhesives which contains no such chain extending agent.
摘要:
An aqueous dispersion of a water-dispersible polyurethane, said polyurethane comprising the reaction product of:
(a) a water-dispersible isocyanate-terminated polyurethane prepolymer having an NCO content of 2.1 to 10% by weight, (b) an organic polyisocyanate having an average isocyanate functionality of 2.1 to 4.0, and (c) an active hydrogen-containing chain extender.
摘要:
This invention, therefore, relates to the field of polyurethane coatings for use in automobile basecoat/clearcoat systems. In particular, this invention relates to water-dispersible polyurethane resins having polyether sidechains which may be utilized in basecoat compositions as principal resins or grind resins. These polyurethane resins may be laterally stabilized or terminally stabilized. The terminally stabilized resins of this invention are preferably employed as principal resins in basecoat compositions.
摘要:
Wäßrige Polyurethan-Polyharnstoffdispersionen werden hergestellt durch Umsetzung eines Isocyanates mit wenigstens zwei isocyanatreaktiven Verbindungen von denen die eine ionische oder potentiell ionische Gruppen aufweist, wobei das Isocyanat zunächst mit der ionische oder potentiell ionische Gruppen aufweisenden Verbindungen umgesetzt wird.
摘要:
An aqueous polymer dispersion containing a vinyl polymer and a nonionic water-dispersible polyurethane having pendent polyoxyethylene chains, the vinyl polymer having been formed by the free radical polymerisation of at least one vinyl monomer in the presence of an aqueous dispersion of the polyurethane. The dispersions are useful as coating compositions.
摘要:
The present invention relates to a stable, aqueous dispersion of polyurethane-ureas wherein said polyurethane-ureas contain
i) about 2 to 200 milliequivalents per 100 grams of polyurethane-urea of chemically incorporated anionic groups, and ii) up to about 15% by weight, based on the weight of the polyurethane-urea, of lateral and/or terminal hydrophilic chains containing ethylene oxide units, wherein the counterions of the anionic groups are a mixture of volatile and non-volatile cations in an equivalent ratio of about 1:10 to 10:1.
The present invention is also directed to the coatings and films prepared from these dispersions.
摘要:
Non-silicone urea-based adhesives are disclosed which are prepared by the polymerization of reactive oligomers with the general formula X—B—X, where X is an ethylenically unsaturated group and B is a unit free of silicone and containing urea groups. The reactive oligomers can be prepared from polyamines through chain extension reactions using diaryl carbonates followed by capping reactions. Adhesive articles, including optical adhesive articles may be prepared using the disclosed non-silicone urea-based adhesives.
摘要:
Adhesive compositions of the invention are useful as pressure-sensitive-adhesives and heat-activatable adhesives. Advantageously, adhesive compositions of the invention comprise polymers that are polyurea-based. Adhesive compositions of the invention are useful in a wide variety of applications, including adhesive tapes. One method of preparing such adhesive compositions includes providing at least one polyisocyanate; providing at least one polyamine; reacting the at least one polyisocyanate with the at least polyamine to form the polyurea-based polymer; and optionally adding a tackifier to the polyurea-based polymer.
摘要:
Adhesive compositions of the invention are useful as pressure-sensitive-adhesives and heat-activatable adhesives. Advantageously, adhesive compositions of the invention comprise polymers that are polyurea-based. Adhesive compositions of the invention are useful in a wide variety of applications, including adhesive tapes. One method of preparing such adhesive compositions includes providing at least one polyisocyanate; providing at least one polyamine; reacting the at least one polyisocyanate with the at least polyamine to form the polyurea-based polymer; and optionally adding a tackifier to the polyurea-based polymer.