摘要:
The invention relates to a process for the preparation of polyether polyols with equivalent molecular weights of from 8,000 to 20,000 g/mol from one or more H-functional starter compounds and one or more alkylene oxides in the presence of a double metal cyanide catalyst, characterized in that the alkylene oxides are metered into the reactor in the course of from 15 to 23 h.
摘要:
The invention relates to a process for the preparation of a polyurethane polymer, comprising the step of reaction ofA) polyester polyols with secondary hydroxyl end groups, which are obtainable from the reaction of a polyester comprising carboxyl end groups with an epoxide of the general formula (1): wherein R1 represents an alkyl radical or an aryl radical and wherein the polyester comprising carboxyl end groups has an acid number of from ≧25 mg of KOH/g to ≦400 mg of KOH/g and a hydroxyl number of ≦5 mg of KOH/g, with B) polyisocyanates which are chosen from the group comprising toluoylene-diisocyanate, diphenylmethane-diisocyanate, polymeric diphenylmethane-diisocyanate, xylylene-diisocyanate, naphthylene-diisocyanate, hexamethylene-diisocyanate, diisocyanatodicyclohexylmethane and/or isophorone-diisocyanate. The invention furthermore relates to polyurethane polymers prepared by such a process.
摘要:
The present invention provides a process for producing polyether ester polyols on the basis of renewable raw materials, the polyether ester polyols produced by the process according to the invention, the use thereof for the purpose of producing polyurethanes, and also polyurethanes containing the polyether ester polyols according to the invention
摘要:
The invention relates to etherified lactate esters of formula (I), in which R represents alkyl and RI an alkoxylated alkyl radical and to the use thereof for enhancing the effect of plant protecting agents.
摘要:
The invention provides a process for producing rigid polyurethane-polyisocyanurate foams using polyols having a high proportion of secondary hydroxyl end groups. The invention further relates to the rigid polyurethane-polyisocyanurate foams thus obtainable and to the use thereof in the production of composite elements from rigid polyurethane-polyisocyanurate foams and suitable outer layers. The invention further provides the composite elements thus obtainable.
摘要:
The invention relates to a method for producing polyether carbonate polyols, wherein (i) in a first step a polyether carbonate polyol is produced from one or more H-functional starter substances, one or more alkylene oxides, and carbon dioxide in the presence of at least one DMC catalyst, and (ii) in a second step the polyether carbonate polyol is chain-extended with a mixture of at least two different alkylene oxides in the presence of at least one DMC catalyst. The invention further relates to polyether carbonate polyols that contain a terminal mixed block of at least two alkylene oxides and to a method for producing soft polyurethane foams, wherein a polyol component containing a polyether carbonate polyol according to the invention is used.
摘要:
The present invention relates to reactive diluents for moisture-curing coating systems containing silane groups. The invention further relates to a method for the production of said diluents, and to the use thereof in coating agents, adhesives and sealants.
摘要:
Polyether polyols with an OH number of from 15 to 120 mg of KOH/g are produced by (i) introducing a mixture of DMC catalyst and a poly(oxyalkylene)polyol or a mixture of DMC catalyst and a polyether polyol (“heel”) obtainable by the process according to the invention is initially into a reactor and (ii) continuously introducing one (or more) low molecular weight starter compound(s) with a (mixed) hydroxyl functionality of from 2.2 to 6.0 and a mixture composed of a) 73 to 80 parts by weight (per 100 parts by weight of a) plus b)) of ethylene oxide and b) 27 to 20 parts by weight (per 100 parts by weight of a) plus b)) of at least one substituted alkylene oxide corresponding to a specified formula into the mixture from step (i). These polyether polyols are particularly useful for the production of flexible polyurethane foams.
摘要:
The invention is directed to a double-metal cyanide catalyst for the preparation of a polyether polyol by the polyaddition of an alkylene oxideon to a starter compound containing active hydrogen atoms, wherein the DMC catalyst comprises a) at least one double-metal cyanide compound; b) at least one organic complexing ligand; and c) two different complexing components.
摘要:
The invention is directed to a double-metal cyanide catalyst for the preparation of a polyether polyol by the polyaddition of an alkylene oxide on to a starter compound containing active hydrogen atoms, wherein the DMC catalyst comprises a) at least one double-metal cyanide compound; b) at least one organic complexing ligand which is not a polyether, a bile acid, a bile acid salt, a bile acid ester or a bile acid amide; c) at least one polyether; and d) at least one bile acid, bile acid salt, bile acid ester or bile acid amide. The catalyst of the present invention has increased activity in the preparation of a polyether polyol.