Water-soluble glass composition
A zinc and bismuth containing, water-soluble glass composition comprising from 10 to 75 mole % P 2 0 5 , 5-50 mole % alkali metal oxide, up to 40 mole % ZnO and up to 40 mole % Bi 2 0 3 .
1 . A zinc and bismuth containing, water-soluble glass composition comprising:
10 to 75 mole % P 2 0 5 ,
5-50 mole % alkali metal oxide,
up to 40 mole % ZnO and
up to 40 mole % Bi 2 0 3 .
2 . A composition according to claim 1 , wherein the mole ratio of zinc to bismuth in the composition is in the range from 1:100 to 100:1.
3 . A composition according to claim 1 , wherein the composition comprises 5-40 mole %, of an alkali metal oxide.
4 . A composition according to claim 1 , wherein the composition comprises more than 10 mole % of an alkali metal oxide.
5 . A composition according to claim 3 , wherein the alkali metal oxide is one or more of: Li 2 0, Na 2 0, K 2 0.
6 . A composition according to claim 1 , wherein the composition comprises less than 10 mole % of an alkaline earth oxide.
7 . A composition according to claim 6 , wherein the alkaline earth oxide is calcium oxide (CaO).
8 . A composition according to claim 1 , wherein the composition comprises a refining agent.
9 . A composition according to claim 8 , wherein the refining agent comprises less than 10 mole % of the composition.
10 . A composition according to claim 8 , wherein the refining agent is a sulphate or oxide of antimony, arsenic, cerium, manganese or an admixture thereof.
11 . A composition according to claim 1 , wherein the composition comprises an oxide of an element from the group consisting of silicon, germanium, tin and lead.
12 . A composition according to claim 11 , wherein the amount of the silicon, germanium, tin or lead oxide is less than 10 mole %.
13 . A composition according to claim 1 , wherein the composition comprises an oxide of an element from the group consisting of gallium, aluminium and boron.
14 . A composition according to claim 11 , wherein the amount of the gallium, aluminium or boron oxide is from 0.1 to 10 mole %.
15 . A composition comprising:
from 41 to 54 mole % of P 2 O 5 ,
from 20 to 30 mole % of alkali oxides,
up to 5 mole % of SO 3 ,
from 15 to 25 mole % of ZnO,
from 0.2 to 1.5 mole % Bi 2 0 3 ,
less than 3 mole % of alkaline-earth oxides, and,
from 0.3 to 3 mole % of oxides of elements selected from the group consisting of silicon, aluminium and boron.
16 . A composition according to claim 1 , wherein the composition is in the form of a shaped body.
17 . A composition according to claim 1 , wherein the composition is in a comminuted form.
18 . A method of inhibiting the corrosion of glassware in an automatic dishwashing machine which method comprises the steps of:
supplying a composition comprising a zinc and bismuth containing,
water-soluble glass composition comprising
from 10 to 75 mole % P 2 0 5 ,
5-50 mole % alkali metal oxide,
up to 40 mole % ZnO and.
up to 40 mole % Bi 2 0 3 to an automatic dishwashing machine.
19 . A method of inhibiting the corrosion of glassware in an automatic dishwashing machine which method comprises the step of:
providing a corrosion inhibiting amount of a composition according to claim 1 to glassware being cleaned in an automatic dishwashing machine.