01-02-2018 дата публикации
Номер: US20180030231A1
Принадлежит:
The invention relates to the co-use of a) a certain type of silica and b) a certain type of graphite, wherein the silica and the graphite are used in a weight ratio in a range of from 1:1 to 1:10, for decreasing the thermal conductivity of vinyl aromatic polymer foam. 2. The method according to claim 1 , wherein the silica has a BET surface of 3 to 80 m/g claim 1 , preferably 5 to 70 m/g claim 1 , more preferably 8 to 60 m/g claim 1 , such as 10 to 50 m/g claim 1 , in particular 13 to 40 m/g claim 1 , most preferably 15 to 30 m/g claim 1 , such as about 20 m/g.3. The method according to claim 1 , wherein the silica has an average particle size within a range of from 20 to 800 nm claim 1 , preferably 30 to 600 nm claim 1 , such as 40 to 400 nm claim 1 , in particular from 100 to 200 nm.4. The method according to claim 1 , wherein the amount of silica is 0.1 to 1.6 wt. % claim 1 , preferably 0.5 to 1.5 wt. % claim 1 , more preferably about 1.0 wt. % claim 1 , based on the weight of the polymer.5. The method according to claim 1 , wherein the particle size of the graphite is from 0.1 to 30 μm claim 1 , preferably from 0.5 to 25 μm claim 1 , in particular from 1 to 10 μm; for example from 3 to 8 μm.6. The method according to claim 1 , wherein the amount of graphite is in a range of from 1.0 to 8.0 wt. % claim 1 , preferably in a range of from 1.5 to 7.0 wt. % claim 1 , in particular in a range of from 2.0 to 6.0 wt. % claim 1 , such as in a range of from 2.5 to 5.0 wt. % claim 1 , e.g. in a range of from 3 to 4 wt. %.7. The method according to claim 1 , wherein a) the silica and b) the graphite are used in a weight ratio a):b) in a range of from 1:1.5 to 1:8 claim 1 ,preferably wherein a) the silica and b) the graphite are used in a weight ratio a):b) in a range of from 1:2 to 1:5,more preferably wherein a) the silica and b) the graphite are used in a weight ratio a):b) of about 1:3.8. The method according to claim 1 , wherein the polymer foam further comprises one or ...
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