초록 ▼

Described are hydrophobic particulate inorganic oxides useful for reinforcing polymeric composition, e.g., rubber. The materials are characterized by: (a) the substantial absence of functional groups capable of chemical reaction with rubber; (b) a BET surface area of in the range of from 40 to 350 m

Described are hydrophobic particulate inorganic oxides useful for reinforcing polymeric composition, e.g., rubber. The materials are characterized by: (a) the substantial absence of functional groups capable of chemical reaction with rubber; (b) a BET surface area of in the range of from 40 to 350 m2/g; (c) a hydroxyl content in the range of 2 to 15 OH/nm2; (d) a carbon content in the range of from 0.1 to 6 percent by weight that is substantially non-extractable; (e) a pH in the range of from 3 to 10; (f) an M1 Standard White Area less than 0.4 percent and (g) a methanol wettability of from 15 to 45 percent. Compositions such as polymers, cured organic rubber articles, master batches and slurries containing the hydrophobic fillers are also described.

대표청구항 ▼

We claim: 1. A cured organic rubber article having dispersed therein from 10 to 150 parts per 100 parts of rubber of a hydrophobic particulate inorganic oxide selected from the group consisting of amorphous precipitated silica, alumina and mixtures of such inorganic oxides, said hydrophobic inorgan

We claim: 1. A cured organic rubber article having dispersed therein from 10 to 150 parts per 100 parts of rubber of a hydrophobic particulate inorganic oxide selected from the group consisting of amorphous precipitated silica, alumina and mixtures of such inorganic oxides, said hydrophobic inorganic oxide being characterized by (a) a substantial absence of functional groups capable of chemically reacting with rubber, (b) a hydroxyl content of from 4-12 OH/nm2, (c) a carbon content of from 0.3 to 3 weight percent that is substantially non-extractable, (d) a methanol wettability of from 25 to 35 percent, (e) an M1 Standard White Area of less than 0.2 percent, and (f) a BET surface area of from 40 to 350 m2/g. 2. The cured organic rubber article of claim 1 wherein the organic rubber comprises styrene-butadiene rubber, polybutadiene or mixtures thereof. 3. The cured organic rubber article of claim 2 wherein the article is a tire.