Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
79 words
A boron containing precipitated silica having the following physical-chemical data ______________________________________
Loss on heating Weight % 14-40
pH 4-6
Conductivity in 4% aqueous
μS <800
dispersion
Bulk density g/l 130 ± 100
Sieve residue according to
Weight % 0.1
Alpine >63μ
SiO.sub.2 content based on original
Weight % 9-76
material
B.sub.2 O.sub.3 content based on original
Weight % 10-51
material
Na.sub.2 O content based on original
Weight % <0.5
SO.sub.3 content based on original
Weight % <0.8
material
______________________________________
Claim 2
Dependent Claim
79 words
A boron containing precipitated silica having the following physical-chemical data ______________________________________
Loss on heating Weight % 14-40
pH 4-6
Conductivity in 4% aqueous
μS <800
dispersion
Bulk density g/l 130 ± 100
Sieve residue according to
Weight % 0.1
Alpine >63μ
SiO.sub.2 content based on original
Weight % 9-76
material
B.sub.2 O.sub.3 content based on original
Weight % 10-51
material
Na.sub.2 O content based on original
Weight % <0.5
SO.sub.3 content based on original
Weight % <0.8
material
______________________________________
Claim 3
Dependent Claim
18 words
A precipitated silica according to claim 1 containing 25-51% B 2 O 3 based on the original material.
Claim 4
Dependent Claim
18 words
A precipitated silica according to claim 2 containing 28.1-51% B 2 O 3 based on the original material.
Claim 5
Dependent Claim
28 words
A precipitated silica according to claim 1 wherein the weight ratio of SiO 2 to B 2 O 3 is from 45.7 to 28.1 to 9.15 to 50.65.
Claim 6
Dependent Claim
51 words
A process for the production of the boron containing precipitated silica of claim 1 comprising supplying precipitated silica and ortho boric acid in the ratio of 0.1 to 3.5:1 continuously to a jet mill and micronizing the silica and boric acid together by means of grinding air at about room temperature.
Claim 7
Dependent Claim
21 words
A process according to claim 5 wherein the precipitated silica employed has a BET surface area of 100-700 m 2 /g.
Claim 8
Dependent Claim
14 words
A process according to claim 5 wherein there is employed unground, spray dried silica.
Claim 9
Dependent Claim
14 words
A process according to claim 5 wherein there is employed unground silica furnace granulate.
Claim 10
Dependent Claim
18 words
A process according to claim 5 where there is employed as the boron containing component ortho boric acid.
Claim 11
Dependent Claim
18 words
A process according to claim 5 wherein there is employed as the boron containing component meta boric acid.
Claim 12
Dependent Claim
19 words
A composition comprising a hardenable elastomeric diorganopolysiloxane containing as a filler the boron containing precipitated silica of claim 1.
Claim 13
Dependent Claim
12 words
A composition according to claim 11 wherein the polysiloxane is dimethyl polysiloxane.
Claim 14
Dependent Claim
19 words
A composition comprising a hardenable elastomeric diorganopolysiloxane containing as a filler the boron containing precipitated silica of claim 2.
Claim 15
Dependent Claim
19 words
A composition comprising a hardenable elastomeric diorganopolysiloxane containing as a filler the boron containing precipitated silica of claim 3.