摘要:
Thermoplastic polyurethanes are formed from a polydiene diol, preferably a hydrogenated polybutadiene diol, having from 1.6 to 2 terminal hydroxyl groups per molecule and a number average molecular weight between 500 and 20,000, an isocyanate having two isocyanate groups per molecule, and optionally a chain extender having two hydroxyl groups per molecule. The thermoplastic polyurethane composition is prepared by a prepolymer method, preferably a solventless prepolymer method using the branched chain extender.
摘要:
The present invention relates to a structural adhesive composition comprising a polyurethane which is obtainable by reacting a polyisocyanate having a functionality in the range of from 2 to 3 and a hydrogenated polybutadiene polyol, having a functionality in the range from 1.5 to 2.5, and a 1,2 vinyl content prior to hydrogenation of from 30 to 70 % by weight, and wherein the NCO:OH molar ratio is in the range from than 1.05 up to 1.6. The present invention further relates to a multi-component system for preparing structural adhesives, to a process for preparing structural adhesives, and to articles containing the structural adhesives.
摘要:
Die vorliegende Erfindung betrifft einen bei Normalklimabedingungen mindestens 120 Stunden, bevorzugt 168 Stunden lagerstabilen, latent-reaktiven Schmelzklebstoff, welcher mindestens ein oberflächendesaktiviertes Polyisocyanat, mindestens ein hydrophobes isocyanatreaktives Polymer und mindestens einen hydrophoben Zuschlagstoff enthält. Weiterhin betrifft die vorliegende Erfindung mit diesem Schmelzklebstoff damit hergestellte Schichten, die trotz dieser Lagerbedingungen im wesentlichen blasenfrei ausgehärtete Schmelzklebstoffgrenzschichten und somit kohäsive Bruchbilder bei Zugscherprüfung ergeben. Der Schmelzklebstoff hat mindestens die Hydrophobizität der Einzelsubstanzen und erreicht damit eine Wasseraufnahme, die maximal bei 0.3 Gew.% liegt. Teil der vorliegenden Erfindung ist weiterhin ein mit diesem Schmelzklebstoff hergestelltesmodulares mindestens 120 Stunden bei Normalklima lagerstabiles, latent-reaktives Bauteil und ein Verfahren zum Verkleben eines modularen Bauteils mit einem weiteren Substrat.
摘要:
Pressure sensitive structural adhesive and sealant compositions comprising: (a) a polymer system comprising from 95 to 15 percent by weight of a telechelic polymer and from 5 to 85 percent by weight of a heterotelechelic polymer wherein at least one of the functionalities thereon is the same as the functionality on the telechelic polymer, and (b) a dual curing system wherein one element of the curing system cures the telechelic polymer and the common functionality on the heterotelechelic polymer and the other element cures the functionality on the heterotelechelic polymer but does not cure under the conditions required to cure the telechelic polymer to form a structural adhesive or sealant composition. In a preferred embodiment, the polymer system is comprised of a hydroxyl functional telechelic diol or polyol polymer and the heterotelechelic polymer is a monohydroxylated polydiene polymer which also has epoxidized olefin functionality. The dual curing system preferably is comprised of an isocyanate curing agent to cure through the hydroxyl groups at ambient temperatures to form a pressure sensitive adhesive or sealant and an amino resin to cure through the epoxy functionality upon baking to form a structural adhesive or sealant.
摘要:
The present invention relates to a compounded rubber composition comprising:
(a) a hydrogenated, polydiene diol based polyurethane having a hard segment content of 10% or greater; (b) a non-polar extender oil in an amount from 10 to 400 phr; and/or (c) one or more thermoplastic resin(s) in an amount from 5 to 100 phr.
The invention further relates to molded articles prepared from the compounded rubber composition of the present invention.
摘要:
Polyurethane foams having high resilience and significantly improved humid ageing are formed from a polydiene diol, preferably a hydrogenated polybutadiene diol, having a hydroxyl functionality from 1.6 to 2.0 and from an aromatic polyisocyanate having an isocyanate functionality of from 2.5 to 3.0. The polydiene diol is preferably blended with foaming agents prior to addition of the highly reactive polyisocyanate.
摘要:
Star polymers of isoprene or butadiene having terminal hydroxyl groups have reduced viscosity when the hydroxyl groups are located on poly-meric arms that are grown from the core of the star molecules. The polymers are useful in making coatings, sealants, and binders.
摘要:
A process for making polymers of conjugated dienes containing hydroxyl groups in the diene blocks, which process comprises (a) making a precursor polymer by polymerizing at least one conjugated diene which leaves 1,2 disubstituted, 1,1 disubstituted, 1,1,2 trisubstituted or tetrasubstituted olefinic unsaturation in the polymer, (b) epoxidizing said precursor polymer such that epoxy groups form at said substituted sites and the amount of epoxy functionality in the polymer is from 0.1 to 5 meq/g polymer, and (c) contacting the epoxidized polymer with an alcohol having one unprotected hydroxyl group and either a compound of general formula MX n , wherein M is selected from the group consisting of hydrogen, boron, aluminium, iron and tin; X is a halogen; and n is an integer corresponding with the valence of M, or an organic complex thereof. A conjugated diene block copolymer containing 0.1 to 15 meq/g polymer of hydroxyl groups, which polymer is comprised of alcohol groups of the formula
wherein P is -OH, -CI or -OR with R being selected from the group consisting of alkyl radicals containing up to 10 carbon atoms, monohydric and dihydric alcohol groups and carbonate groups; Q is -OH or Cl with the proviso that at least one of P and Q is -OH and R 1 and R 2 are hydrogen or alkyl radicals with the proviso that if P is -OR only one of R 1 and R 2 can be hydrogen.