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1. WO2011089061 - MATERIALS COMPRISING A MATRIX AND PROCESS FOR PREPARING THEM

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[ EN ]

CLAIMS

1. A particulate material having a number average particle diameter of 1 μηι-l cm, exhibiting a solid-solid phase change in the temperature range -10 °C to +100 °C, as measured by differential scanning calorimetry (DSC), and comprising:

a matrix material comprising a plurality of urethane and/or urea and/or isocyanurate groups and having a hardblock content of more than 75 % (hereinafter called matrix A); and

a polymeric material which 1 ) exhibits a phase change as measured by differential scanning calorimetry (DSC) in the temperature range -10 °C to +100 °C, 2) forms a semi-interpenetrating network together with said matrix A, 3) has a number average molecular weight of more than 700 and 4) has no groups which are able to form a urethane, urea or isocyanurate group with an isocyanate group (hereinafter called polymeric material B); wherein the relative amount of said matrix A and of said polymeric material B, on a weight basis, ranges from 10:90 to 75:25.

2. Material according to claim 1 wherein the hardblock content in matrix A is at least 90 %.

3. Material according to claims 1 -2 wherein polymeric material B comprises at least 50 % by weight, based on the weight of this polymeric material B, of oxyalkylene groups, wherein at least 85 % of these oxyalkylene groups are oxyethylene groups.

4. Material according to claims 1 -3 wherein polymeric material B exhibits a phase change with an enthalpy AHm of at least 87 J/g.

5. Material according to claim 4 wherein AHm is at least 90 J/g.

6. Process for preparing a material according to claims 1 -5 which process comprises reacting the ingredients for making matrix A in the presence of polymeric material B wherein the relative amount of the ingredients for making matrix A and of polymeric material B, on a weight basis, is such that the relative amount of the matrix A obtained and the polymeric material B ranges from 10:90 to 75:25 and producing a particulate material having a number average diameter of 1 μηι-1 cm and comprising said matrix A and material B.