摘要:
A process for producing an optical material of the present invention includes a step of mixing di- or higher-functional thiol compounds (A) having one or more sulfide bonds and/or one or more ester bonds with an imidazole-based curing catalyst (B) to prepare a mixed solution; a step of mixing the mixed solution with an isocyanate compound (C) including at least one kind of a di- or higher-functional alicyclic isocyanate compound (c1) and/or a di- or higher-functional aliphatic isocyanate compound (c2) to prepare a polymerizable composition for optical materials; a step of injecting the polymerizable composition for optical materials into a mold; and a step of polymerization-curing the polymerizable composition for optical materials in the mold.
摘要:
A rigid polyurethane foam which has ultrafine cells, has a low thermal conductivity of 0.0190 W/(m·K) or lower, exhibits excellent heat insulating properties and flame retardancy, and has very little impact on global warming, without using a special apparatus such as a gas loading device. Provided is a rigid polyurethane foam which is obtained by mixing and reacting raw materials including a polyol, a polyisocyanate, a blowing agent, and a catalyst. The rigid polyurethane foam contains the polyol containing a polyester polyol having an aromatic component concentration of 17-35 wt. %, and a non-amine-based polyether polyol and/or an aromatic amine-based polyether polyol; the polyisocyanate in which MDI/TDI are mixed at a ratio of 4/6 to 9/1; and the blowing agent containing a halogenated olefin.
摘要:
The polymerizable composition of the present invention contains (A) an alicyclic isocyanate compound (a1) having two or more functional groups and/or an aliphatic isocyanate compound (a2) having two or more functional groups, (B) a thiol compound having one or more sulfide bonds and/or one or more ester bonds and having two or more functional groups, and (C) an imidazole-based curing catalyst, in which the amount of the imidazole-based curing catalyst (C) is 5 ppm to 3,000 ppm with respect to the total amount of the isocyanate compound (A) and the thiol compound (B).
摘要:
A rigid polyurethane foam which is a polymerization product of a composition including a concentrated acid hydrolytic lignin, a polyol, and an isocyanate, and a method of preparing the rigid polyurethane foam.
摘要:
A process for producing a rigid polyurethane foam by reacting an organic polyisocyanate with a polyol component containing a compound with at least two hydrogen atoms which are reactive toward isocyanate groups in the presence of a blowing agent, a catalyst, and optionally auxiliaries and additives, wherein the polyol component contains, by weight: 20 to 60 parts of a polyether alcohol having a functionality of 3.5 to 5.5 and a hydroxyl number of from 400 to 550 mg KOH/g; 1 to 20 parts of a polyether alcohol based on an aliphatic amine and having a functionality of 3.5 to 4.5 and a hydroxyl number of 450 to 900 mg KOH/g; 10 to 30 parts of a polyether alcohol and/or aromatic polyester alcohol having functionalities of 1.5 to 3 and a hydroxyl number of from 150 to 450 mg KOH/g; and optionally 1 to 5 parts of water.
摘要:
The polymerizable composition of the present invention contains (A) an alicyclic isocyanate compound (a1) having two or more functional groups and/or an aliphatic isocyanate compound (a2) having two or more functional groups, (B) a thiol compound having one or more sulfide bonds and/or one or more ester bonds and having two or more functional groups, and (C) an imidazole-based curing catalyst, in which the amount of the imidazole-based curing catalyst (C) is 5 ppm to 3,000 ppm with respect to the total amount of the isocyanate compound (A) and the thiol compound (B).
摘要:
Catalyst compositions useful in the production of insulating polyurethane or polyisocyanurate foam are disclosed. The catalyst compositions impart increased stability of a mixture of the catalyst, a halogen-containing blowing agent, and a polyol. These catalyst compositions comprise of at least 10% of a tetraalkylguanidine and at least 10% of a tertiary amine catalyst with an isocyanate reactive group. These improved catalysts can be used with any halogenated blowing agent, and provide substantial stability benefits with the use of hydrofluoroolefins and hydrofluorochloroolefins. In an exemplary embodiment, a process includes providing a pre-mix comprising a hydrohaloolefin blowing agent, at least one polyol, water, and a catalyst comprising 10-50% tetra methylguanidine and 10-90% of one or more of an amine catalyst containing an isocyanate reactive group.
摘要:
The present invention describes cyclic amine compounds useful for catalysts for polyurethane form-forming compositions. The cyclic amine compounds of the invention provide distinct benefits for reaction compositions, methods, and polyurethane foams based on their desirable physical and catalytic properties.
摘要:
A heat-activable powder adhesive composition for use in bonding a component to a surface such as glass is disclosed. The composition of the disclosed invention includes at least two polymers, at least one solid di- or poly-isocyanate in powder form, and a catalyst. The two polymers each have a melting point above 40° C. and are selected from the group consisting of di-functional polymers and multi-functional polymers. The preferred method of preparing the composition of the disclosed invention includes first forming three parts, including a first melted part comprising the polymers, a second melted part comprising the polymers and a catalyst, and a third part comprising the isocyanate. Once cooled, each of the first and second parts forms solid blocks which are fragmented and sieved. The three dry parts are then brought together to form the adhesive powder of the disclosed invention. The adhesive powder can be pre-applied to the attachment surface of a component to be bonded. The composition does not require either a deactivating agent or a blocking agent for deactivating the isocyanate or the catalyst nor does it require either a deactivated isocyanate or a deactivated catalyst.