The present invention refers to a method for the preparation of a polymer polyol which comprises: (i) preparing an intermediate in a first reactor by polymerizing a mixture comprising: (a) a base polyol in an amount from 60 to 100 wt % of the total amount of base polyol, (b) at least one ethylenically unsaturated monomer, (c) an acylperoxide radical initiator in an amount from 50 to 90 wt % of the total amount of acylperoxide radical initiator, and (d) a preformed stabilizer in an amount from 70 to 100 wt % of the total amount of preformed stabilizer or a macromer in an amount of from 70 to 100 wt % of the total amount of macromer; (ii) polymerizing in a second reactor a mixture comprising the intermediate prepared in step (i), the balance acylperoxide radical initiator proportion, the balance preformed stabilizer or macromer proportion and the balance base polyol proportion;
wherein the at least one ethylenically unsaturated monomer is added only to the first reactor.

This invention relates to improved flexible foams prepared from polymer polyols and to a process for preparing these improved flexible foams.

This invention relates to an in-situ formed polyether polyol blend having an overall functionality of 2 to 3 and an overall hydroxyl number of 40 to 220 mg KOH/g. A process for preparing these in-situ formed polyether polyol blends is also disclosed. These in-situ formed polyether polyol blends are suitable for a process of preparing viscoelastic flexible polyurethane foams.

Recovery times and/or airflow of flexible polyurethane foam is increased by including certain tackifiers in the foam formulation. The tackifiers are characterized in being incompatible with polyol or polyol mixture used to make the foam, having a viscosity of at least 5,000 centipoise at 25 #C and having a glass transition temperature of at most 20 #C. The tackifier is pre-blended with certain monols to form a lower-viscosity blend that is combined with one or more other polyols and a polyisocyanate to form a reaction mixture for producing a polyurethane foam.

The present invention provides reactive multi-functional dialkyl phosphinate compound(s), serving as highly efficient reactive flame retardants in flexible polyurethane foams. The invention further provides fire-retarded polyurethane compositions comprising said multi-functional dialkyl phosphinate compound and applications containing the same.

A polyurethane foam is disclosed having unique load bearing characteristics rendering it suitable for a variety of applications. The foam exhibits high surface-softness and smoothness properties, making it well-suited for use in articles such as pillows and mattress toppers. However, upon continued application of pressure, the resilience of the foam increases sharply, translating into a remarkable support characteristics that make the foam suitable for use in the seat portions of chairs and sofas, as well as in the base portion of mattresses. The foams therefore address the limitations of conventional, high-resilience and visco-elastic polyurethane foams. A process of making the foam and its use in various articles is also disclosed.

Disclosed is a polyurethane foam formulation based on conventional polyether and novolac polyols with, in particular, MDI for the production of soft-elastic PUR moulded foams with viscoelastic properties, in particular for sound insulation with foams based thereon.

Disclosed is a polyurethane foam formulation based on conventional polyether and polyester polyols based on renewable raw materials, with in particular MDI, for the production of preferably viscoelastic PUR moulded foams and sound insulations with foams based thereon.

The present invention relates to a polyurethane microcellular elastomer, a non-pneumatic tire and a preparation process and use thereof. The polyurethane microcellular elastomer of the present invention is obtained by reaction of a reaction system comprising components such as isocyanate, ethylene diamine-started polyoxypropylene ether tetraol, a catalyst and a foaming agent. The non-pneumatic tire of the present invention has very strong fatigue resistance and can be used for non-motor vehicles running at high speed.

A method of forming a flexible polyurethane foam that passes BS 5852:2006 source V (Crib 5) test. The method includes providing a modified polyisocyanate polyaddition (PIPA) 5 polyol formed by contacting a PIPA polyol dispersion with at least one carboxylic acid having a melting point above zero degree Celsius and present in a carrier solvent. The PIPA polyol dispersion has a polyol liquid phase content of 60 wt. % to 90 wt. % and a solid particle phase content of 10 wt. % to 40 wt. % based on a total weight of the PIPA polyol dispersion. From 10 weight percent (wt. %) to 80 wt. % of the modified PIPA polyol is combined with 90 wt. % to 20 10 wt. % of at least another polyether polyol based on a total weight of a polyol blend of the PIPA polyol and the at least another polyether polyol, where the polyether polyol is formed with propylene oxide and ethylene oxide and has an equivalent weight of 1,000 to 2,000 and a functionality of 3 to 6. The combination of the modified PIPA polyol and the polyether polyol are reacted with a polyisocyanate and a blowing agent to form the flexible polyurethane foam.