The present invention relates to a polypropylene composition comprising —10 to 50 wt. % of recycled polypropylene (R-PP) and/or linear polypropylene (L-PP); —40 to 89.95 wt. % of a high melt strength polypropylene (HMS-PP) having an F30 melt strength of more than 25.0 cN and a v30 melt extensibility of more than 205 mm/s, wherein the F30 melt strength and the v30 melt extensibility are determined according to ISO 16790:2005; and —0.05 to 10 wt. % of a nucleating agent (NA); a foamed sheet formed from the polypropylene composition; an article comprising the foamed sheet and a process comprising the step of forming the polypropylene composition. Furthermore, the invention is further directed to the usage of the polypropylene composition for the formation of foamed sheets.

Textiles backed with a polyurethane cushion are produced by applying a layer of frothed polyurethane-forming mixture to a surface of the textile. The mixture contains both water and a physical blowing agent. The layer expands due to the action of the water and the physical blowing agent and cures to form an attached cushion having a density of 176 g/L or less.

What are described are (a) a composition suitable for production of rigid polyurethane foam, comprising at least one isocyanate component, a polyol component, optionally a catalyst that catalyses the formation of a urethane or isocyanurate bond, optionally blowing agents, where the composition additionally comprises hydrocarbons HC, polyether-modified siloxane and optional polyalkylsiloxane, (b) a process for producing rigid polyurethane foam using hydrocarbons HC, polyether-modified siloxane and optional polyalkylsiloxanes, (c) the rigid polyurethane foam thus obtainable and (d) the use thereof.

Polymer foams based on polyetherimides (PEI) meet the legal requirements of the aerospace industry for both the interior and exterior of aircraft.

A heat transfer composition includes: (i) trans-1,3,3,3-tetrafluoropropene (R-1234ze(E)); (ii) a second component selected from difluoromethane (R-32), propene (R-1270), propane (R290) and mixtures thereof; (iii) a third component selected from pentafluoroethane (R-125), 1,1,1,2-tetrafluoroethane (R-34a), and mixtures thereof; and optionally (iv) a fourth component selected from fluoroethane (R-161), 1,1-difluoroethane (R-152a) and mixtures thereof.

The present invention relates to a non-crosslinked block copolymer foam composition, characterised in that it is in the form of a polymer matrix comprising closed cells containing gas, said matrix comprising: from 90 to 99.9% by weight of said block copolymer; and from 0.01 to 10% by weight of metal carbonate, for the total weight of the foam composition. The present invention also relates to a foamable composition and a method for manufacturing said foam, as well as the use of the foam in sports shoe soles, balloons or balls, gloves, personal protection equipment, rail soles, automobile parts, construction parts, electrical and electronic equipment parts, audio equipment, sound- and/or heat-proofing, and parts used to damp vibrations.

A block copolymer composition containing at least one type of block copolymer component obtained by using a vinyl aromatic hydrocarbon and a conjugated diene, wherein the block copolymer composition satisfies the conditions (1) to (3) indicated below. (1) The weight-average molecular weight is at least 100000 and at most 300000, and the conjugated diene content is at least 18 mass % and at most 35 mass %. (2) The vinyl aromatic hydrocarbon block percentage is at least 80% and at most 100% relative to the total amount of the vinyl aromatic hydrocarbon. (3) At least 30 mass % and at most 60 mass % of block copolymer components having a conjugated diene content of at least 30 mass % are included.

A phenolic foam formed from a composition comprising a phenolic resin, a blowing agent, an acid catalyst, and a surfactant comprising: (i) an ethoxylated castor oil, and (ii) a polysiloxane comprising a side chain comprising polyethylene oxide wherein the total molecular weight of the polyethylene oxide of the side chain comprises less than 50% of the total molecular weight of the polysiloxane.

The invention relates to a non-cross-linked copolymer foam with polyamide blocks and polyether blocks, wherein: the polyamide blocks of the copolymer have an average molar mass of from 200 to 1,500 g/mol; the polyether blocks of the copolymer have an average molar mass of from 800 to 2,500 g/mol; and the weight ratio of the polyamide blocks to the polyether blocks of the copolymer is from 0.1 to 0.9. The invention also relates to a method for manufacturing said foam and items manufactured from said foam.

The invention relates to a process for manufacturing a copolymer foam containing polyamide blocks and polyether blocks, comprising the following steps: mixing the copolymer melt with a blowing agent, said copolymer having a coefficient of thermal diffusivity a and a crystallization temperature T.sub.c; providing a mold of thickness h at a temperature T.sub.m; injecting the mixture of the copolymer and of the blowing agent at a temperature T.sub.p, into the closed mold; foaming the mixture by opening the mold;
in which the maintenance time between the injection of the mixture of the copolymer and of the blowing agent into the closed mold and the opening of the mold is within the range extending from (t.sub.opt−25%) to (t.sub.opt+25%),
t.sub.opt being expressed in seconds and obtained by equation (I):

[00001]$\begin{array}{cc}{t}_{\mathrm{opt}}=-\frac{1}{{\pi }^2}\frac{h^2}{a}\ln \left(\frac{\pi }{4}\frac{T_m-T_c}{T_m-T_p}\right),& \left(I\right)\end{array}$

in which a is expressed in m.sup.2/s, h is expressed in m and T.sub.m, T.sub.c and T.sub.p are expressed in ° C.