The invention relates to a process for purification of a polyether polyol which is prepared by ring-opening polymerization of an alkylene oxide in the presence of an initiator having a plurality of active hydrogen atoms and a composite metal cyanide complex catalyst, has a number average molecular weight of at most 10,000 g/mol and contains ultra-high molecular weight (UHMW) components having molecular weights of at least 3 times the number average molecular weight, said process comprising filtering the polyether polyol with a membrane having an average pore size of from 0.5 to 80 nm to produce a permeate comprising a purified polyether polyol containing a reduced amount of UHMW components. Further, the invention relates to a process for preparing a polyether polyol from the purified polyether polyol; and to a process for preparing a polyurethane foam.

Disclosed are compositions that comprise water and a polyether polyol derived from sucrose and an alkylene oxide, as well as polyurethane foam systems comprising such compositions, methods for their production, and the resulting polyurethane foams.

A process for making a flame retardant polyurethane foam, the process comprising reacting a PO based polyol with foam-forming reactants to provide said polyurethane foam, wherein said polyol is prepared by ring-opening polymerization of alkylene oxide in the presence of a composite metal cyanide complex catalyst, and wherein said polyol is either free from EO moieties or comprises EO moieties in an amount of at most 1% w/w.

A rigid foam comprising the reaction product of an (poly)isocyanate, and a polyethercarbonate polyol copolymer is described. The polyethercarbonate polyol copolymer is derived from the copolymerisation of one or more epoxides with CO.sub.2, wherein the total CO.sub.2 content of the polyethercarbonate polyol copolymer is between 1 and 40 wt %, the carbonate linkages are <95% of the total linkages from the copolymerisation, and the molecular weight is between 100 to 5000 g/mol. The foam is a polyurethane foam, more typically, a polyisocyanurate or a mixed polyisocyanurate/polyurethane foam. Methods, polyols and compositions for producing the foams are also described.

Disclosed are a two-component low-density PU structural adhesive, a preparation method therefor and an application thereof. The two-component low-density PU structural adhesive is composed of Component A and Component B, where a volume ratio of Component A to Component B is 1:0.8-1.2, Component A includes polyether carbonate polyol, castor oil or/and modified castor oil, bisphenol A polyether polyol, a chain extender, hollow glass beads, molecular sieve, fumed silica, a silane coupling agent and catalysts, specifically, the polyether carbonate polyol and the castor oil or/and the modified castor oil cannot be zero at the same time; and Component B includes isocyanate prepolymer, polyisocyanate, hollow glass beads, fumed silica, and a dehydrating agent, the present disclosure solves the problems of poor storage stability, low bonding strength and low elongation at break of the low-density structural adhesive in the prior art.

The invention relates to a wind turbine blade, preferably the leading edge of a wind turbine blade, coated with a coating composition comprising: (A) at least one polyaspartic selected from the group consisting of polyaspartic esters, polyetheraspartic esters and mixtures thereof; and (B) at least one aliphatic polyisocyanate prepolymer curing agent: wherein component B further comprises an aliphatic polyisocyanate which is different to the at least one aliphatic polyisocyanate prepolymer curing agent.