摘要:
A polymeric material includes a polyisobutylene-polyurethane block copolymer. The polyisobutylene-polyurethane block copolymer includes soft segments, hard segments, and end groups. The soft segments include a polyisobutylene diol residue. The hard segments include a diisocyanate residue. The end groups are bonded by urea bonds to a portion of the diisocyanate residue. The end groups include a residue of a mono-functional amine.
摘要:
Disclosed herein are compositions and kits of materials for forming a component of a rigid gas permeable lens. An exemplary composition comprises a hydroxyl terminated polyurethane pre-polymer having an average of more than one hydroxyl group per molecule comprising: i) the residue of an aliphatic diisocyanate, a block of comprising polysiloxane and a block comprising hydrophobic poly(alkylene oxide), or ii) the residue of an aliphatic diisocyanate, a block comprising fluoroalkyl or fluoroalkyl ether, and a block of comprising hydrophobic poly(alkylene oxide). The composition further comprises a free aliphatic diisocyanate and a monomeric polyol, or a propoxylate thereof. The average number of hydroxyl groups of the hydroxyl terminated pre-polymer plus the average number of hydroxyl groups of the monomeric polyol, or a propoxylate thereof is equal to from 4.5 to 5.5. Kits of materials comprising elements that when combined form the composition are also disclosed. Further disclosed are articles and ocular devices comprising components formed from the compositions or kits.
摘要:
Die vorliegende Erfindung betrifft ein Verfahren zur Herstellung einer Zusammensetzung (I) mindestens enthaltend ein kompaktes thermoplastisches Polyurethan (P1), umfassend das Be- reitstellen mindestens eines kompakten thermoplastischen Polyurethans (P1) oder eines Reak- tionsgemischs zur Herstellung eines kompakten thermoplastischen Polyurethans (R-P1), die Zugabe mindestens einer Verbindung (N), die eine konjugierte, Stickstoff-haltige aromatische Struktur aufweist, als Nukleationsmittel zu dem mindestens einen thermoplastischen Po- lyurethan (P1) oder dem Reaktionsgemisch zur Herstellung eines kompakten thermoplastischen Polyurethans (R-P1), wobei die Verbindung (N) ein Feststoff ist, sowie das Vermischen des Nukleationsmittels und des thermoplastischen Polyurethans (P1) bzw. des Reaktionsgemischs (R-P1) unter Erhalt einer Zusammensetzung (I). Dabei wird das Nukleationsmittel in einer Men- ge im Bereich von 0,01 Gew.-% bis 2,0 Gew.-%, bezogen auf das thermoplastische Po- lyurethan (P1) bzw. das Reaktionsgemisch (R-P1), eingesetzt. Weiter betrifft die vorliegende Zusammensetzung enthaltend mindestens ein kompaktes thermoplastisches Polyurethan und mindestens einer Verbindung (N), die eine konjugierte, Stickstoff-haltige aromatische Struktur aufweist, als Nukleationsmittel, wobei die Verbindung (N) ein Feststoff ist, sowie die Verwen- dung der genannten Verbindungen als Nukleierungsmittel für ein kompaktes thermoplastisches Polyurethan.
摘要:
A polymer film suited to use as a face mask or transdermal patch includes at least 30 wt. % of a thermoplastic polyurethane polymer which is the reaction product of a first polyether polyol having a molecular weight of at least 3000 daltons, optionally, a second polyether polyol having a molecular weight of no more than 2500 daltons, at least one of a third polyol having a molecular weight of up to 800 daltons, and a chain extender, a diisocyanate, optionally, a catalyst. The film includes up to 5 wt. % water.
摘要:
Composite materials and methods for their preparation are described herein. The composite materials can comprise (a) a polyurethane and (b) from 35% to 90% by weight, based on the total weight of the composite, of a particulate filler dispersed in the polyurethane. The polyurethane can be formed by the reaction of (i) one or more isocyanates selected from the group consisting of diisocyanates, polyisocyanates, and mixtures thereof, and (ii) one or more polyols. The one or more polyols that form the polyurethane comprise a high hydroxyl number polyol having a hydroxyl number of at least 250 mg KOH/g. In some cases, the one or more polyols that form the polyurethane can have a weight average equivalent weight of from 200 to 1100 amu. In some cases, the one or more polyols that form the polyurethane can include less than 5% by weight, based on the total weight of the one or more polyols that form the polyurethane, of one or more flexible polyols having a hydroxyl number of less than 150 mg KOH/g and a functionality of less than 3.
摘要:
The present invention provides a urethane adhesive which is applied to a protective film, of which releasability does not degrade even though it is subjected under a severe condition such as at a high temperature and at a high humidity for a long time, and which is excellent in compatibility. Disclosed is a urethane adhesive comprising a urethane resin obtainable by reacting a polyol with an isocyanate compound; a plasticizer; and a stabilizing agent, wherein the polyol comprises a polyether polyol, and the plasticizer comprises a castor oil based compound. Releasability of the adhesive does not degrade even though the adhesive is kept under a severe condition such as at a high temperature and at a high humidity, and the adhesive is excellent in compatibility with regard to the plasticizer and the stabilizing agent. Since the urethane adhesive is excellent in releasability regarding a glass plate and a polarizer for liquid crystal displays, it is useful for surface protective films used for windowpanes, mobile phones and the like.
摘要:
An object of the present invention is to provide a moisture-curable hot melt adhesive which can substantially suppress generation of carbon dioxide bubbles by a reaction of an isocyanate compound and moisture as well as volume expansion when an uncured adhesive is heated. The present invention relates to a moisture -curable hot melt adhesive for lighting appliances comprising: an urethane prepolymer obtained by mixing a polyol compound and an isocyanate compound, a thermoplastic polyacrylic resin and an oxazolidine compound.
摘要:
The present invention relates to a composition for application to the human and animal body or to plants, comprising at least one active ingredient and/or fragrance, characterized in that it further comprises a polyurethaneurea which is present dissolved in a solvent or solvent mixture, the solvent consisting exclusively of one or more monohydroxy-functional alcohols, or a solvent mixture consisting of exclusively organic solvents, which contains ≥ 50%by weight, based on the total mass of the solvent mixture, of at least one monohydroxy-functional alcohol, is used. The invention additionally embraces the composition for treating the human or animal body, the use of the composition to coat substrates, the substrates not being the human or animal body, and the use of the composition for application to the human or animal body, the active ingredient not having a therapeutic effect.