Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
219 words
A low melting enamel frit comprising 31 to 39 wt% of SiO 2 , 13 to 21 wt% of B 2 O 3 , 14 to 22 wt% of Na 2 0, 1 to 5 wt% of K 2 0, 13 to 20 wt% of ZnO, 2 to 10 wt% of F 2 , and 2 to 9 wt% of at least one intermediate oxide selected from Al 2 O 3 , TiO 2 and ZrO 2 , each intermediate oxide being present in an amount not exceeding 5 wt%; provided that the Sio2/B203 ratio by weight is from 1.5 to 3.0:1; the total amount of ZnO, Al 2 O 3 , Ti0 2 and ZrO 2 is from 17 to 25 wt%; the ZnO/(ZnO + Al 2 O 3 + TiO 2 + ZrO 2 ) ratio by weight is from 0.65 to 0.90:1; the total amount of Na 2 0 + K 2 0 is from 16 to 23 wt%; the (ZnO + Al 2 O 3 + TiO 2 + Zr0 2 )/(Na 2 0 + K 2 0) ratio by weight is from 0.85 to 1.2:1; and the (SiO 2 + B 2 0 3 + F 2 )/(Na 2 0 + K 2 0 + ZnO) ratio by weight is from 1.3 to 2.0:1.
Claim 2
Dependent Claim
219 words
A low melting enamel frit comprising 31 to 39 wt% of SiO 2 , 13 to 21 wt% of B 2 O 3 , 14 to 22 wt% of Na 2 0, 1 to 5 wt% of K 2 0, 13 to 20 wt% of ZnO, 2 to 10 wt% of F 2 , and 2 to 9 wt% of at least one intermediate oxide selected from Al 2 O 3 , TiO 2 and ZrO 2 , each intermediate oxide being present in an amount not exceeding 5 wt%; provided that the Sio2/B203 ratio by weight is from 1.5 to 3.0:1; the total amount of ZnO, Al 2 O 3 , Ti0 2 and ZrO 2 is from 17 to 25 wt%; the ZnO/(ZnO + Al 2 O 3 + TiO 2 + ZrO 2 ) ratio by weight is from 0.65 to 0.90:1; the total amount of Na 2 0 + K 2 0 is from 16 to 23 wt%; the (ZnO + Al 2 O 3 + TiO 2 + Zr0 2 )/(Na 2 0 + K 2 0) ratio by weight is from 0.85 to 1.2:1; and the (SiO 2 + B 2 0 3 + F 2 )/(Na 2 0 + K 2 0 + ZnO) ratio by weight is from 1.3 to 2.0:1.
Claim 3
Dependent Claim
22 words
A low melting enamel frit according to claim 1, wherein ZnO is present in an amount of from 14 to 18 wt%.
Claim 4
Dependent Claim
33 words
A low melting enamel frit according to claim 1 or 2, wherein the total amount of ZnO, Al 2 O 3 , TiO 2 and ZrO 2 is from 18 to 23 wt%.
Claim 5
Dependent Claim
31 words
A low melting enamel frit according to any one of the preceding claims, wherein the total amount of Na 2 0 and K 2 0 is from 17 to 21 wt%.
Claim 6
Dependent Claim
39 words
A low melting enamel frit according to any one of the preceding claims, wherein the ZnO + Al203 + TiO 2 + ZrO 2 /Na 2 O + K 2 0 ratio by weight is from 0.9 to 1.1:1.
Claim 7
Dependent Claim
37 words
A low melting enamel frit according to any one of the preceding claims, further comprising at least one of MoO 3 , V 2 O 5 and SnO in a total amount of up to 3 wt%.
Claim 8
Dependent Claim
18 words
A low melting enamel frit according to claim 6, wherein the amount is from 0.3 to 1 wt%.
Claim 9
Dependent Claim
23 words
A low melting enamel frit according to any one of the preceding claims, further comprising up to 4 wt% of Li 2 0.
Claim 10
Dependent Claim
28 words
A low melting enamel frit according to any one of the preceding claims, further comprising up to 4 wt% of at least one of CaO, MgO and BaO.
Claim 11
Dependent Claim
23 words
An enamelling iron, aluminized steel, stainless steel or cast iron enamelled with a frit as claimed in any one of the preceding claims.