摘要:
An internal mould release composition, suitable for use in the production of moulded articles by the RIM process, comprising:a) a metal salt of an organic acid, said metal salt having mould release properties, andb) a compatibilising amount of an amidine or imidate compound.
摘要:
A polyisocyanate composition, suitable for use in the production of elastomers by the RIM process, or foams, said composition being the product of reacting an imino-functional or enamine-containing compound having a molecular weight of at least 1000 with a stoichiometric excess of an organic polyisocyanate.
摘要:
An internal mould release composition, suitable for use in the production of moulded articles by the RIM process, comprising:a) a metal salt of an organic acid, said metal salt having mould release properties, andb) a compatibilizing amount of an amidine or imidate compound.
摘要:
An isocyanate-reactive polymer comprising the reaction product of:(a) an isocyanate-terminated polyuretane prepolymer formed by reacting a polymeric polyol having a hydroxyl equivalent weight of at least 500 with a stoichiometric excess of an organic polyisocyanate, and(b) a stoichiometric excess, relative to the free isocyanate groups present in the prepolymer, of an imino-functional or enamine-containing compound having a molecular weight less than about 750.
摘要:
An isocyanate-reactive polymer comprising the reaction product of: (a) an isocyanate-terminated polyurethane prepolymer formed by reacting a polymeric polyol having a hydroxyl equivalent weight of at least 500 with a stoichiometric excess of an organic polyisocyanate, and (b) a stoichiometric excess, relative to the free isocyanate groups present in the prepolymer, of an imino-functional or enamine containing compound having a molecular weight less than about 750. The polymer is useful in reaction injection molding systems as an isocyanate-reactive ingredient.
摘要:
Polyurethane/polyurea foams are made by reacting an organic polyisocyanate with resins containing imino/enamino-functional groups in the presence of blowing agents. Control of foam properties is offered by selecting imino/enamino-functional groups which decompose with water at the temperature of the reaction to produce volatile gases.
摘要:
A polyisocyanate composition, suitable for use in the production of elastomers by the RIM process, said composition being the product of reacting an alcohol and/or thiol having an average hydroxyl and/or thiol functionality of from about 1.5 to about 4 and an average hydroxyl and/or thiol equivalent weight of at least 500 with at least 2 equivalents, per hydroxyl and/or thiol equivalent, of an organic polyisocyanate under such conditions that at least about 20% of the initially formed urethane and/or thiourethane groups are converted to allophanate and/or thioallophanate groups.
摘要:
A reaction system for use in making a reaction injection moulded elastomer, said system comprising the following components:(A) a polyisocyanate composition comprising a reaction product of a stoichiometric excess of an organic polyisocyanate and:(i) a polymeric polyol having an average nominal hydroxyl functionality greater than 2 and an average hydroxyl equivalent weight of from about 500 to about 5000, and(ii) a polymeric polyamine having an average nominal primary and/or secondary amino functionality of from about 2 to about 3 and an average amine equivalent weight of from about 500 to about 5000, the polyol and the polyamine having glass transition temperatures below room temperature.(B) an isocyanate-reactive composition comprising at least one imino-functional compound.
摘要:
A polyisocyanate composition comprising a reaction product of a stoichiometric excess of an organic polyisocyanate and:(i) a polymeric polyol having an average nominal hydroxyl functionality greater than 2 and an average hydroxyl equivalent weight of from about 500 to about 5000, and(ii) a polymeric polyamine having an average nominal primary and/or secondary amino functionality of from about 2 to about 3 and an average amine equivalent weight of from about 500 to about 5000, the polyol and the polyamine having glass transition temperatures below room temperature. The composition is especially useful in the production of elastomers by the RIM process.
摘要:
Process for making free rise or slabstock flexible polyurethane foams with high resilience using diphenylmethane diisocyanate and a polyol composition comprising: (a) a polyoxyethylene-polyoxypropylene-polyol, having an average nominal hydroxyl functionality of 2-8, an average equivalent weight of 1000-4000 and containing 10-25% by weight of oxyethylene groups; (b) 3 to 8 parts by weight of water as the sole blowing agent or optionally together with CO2 as the sole blowing agents; and (c) 2 to 20, preferably 2 to 10 parts by weight of a polyether polyol having an average nominal hydroxyl functionality of 2-6, an average equivalent weight of 200-600 and containing at least 60% by weight of oxyethylene groups; and optionally (d) up to 30 and preferably 2-25 parts by weight of particulate material which is dispersed in said polyol composition; the amounts of (b)(ii) to (b)(iv) being calculated per 100 parts by weight of (b)(i); and optionally (e) auxiliaries and additives.