Laminated glass body with opal phase produced between laminae

Claim 1

A laminated glass article consisting of a base glass lamina and a lamina selected from the group consisting of a source glass lamina and a sink glass lamina with an in situ layer of opalization at the interface between said laminae, said base glass being selected from the group of composition fields, expressed in weight percent on the oxide basis: a. 2.5-25% of at least one alkali metal oxide selected from the group consisting of Na 2 O and K 2 O, 2.5- 45% RO, wherein RO consists of CaO, SrO, and BaO and 50- 85% SiO.sub. 2, the sum of alkali metal oxide + RO + SiO.sub. 2 constituting at least 80% of the total composition; b. 5-70% of at least one alkali metal oxide selected from the group consisting of Na 2 O and K 2 O, 5-55% TiO.sub. 2, and 20-70% SiO.sub. 2, the sum of alkali metal oxide + TiO.sub. 2 + SiO.sub. 2 constituting at least 50% of the total composition; c. 30-60% of at least one alkali metal oxide selected from the group consisting of Na 2 O and K 2 O, 10-30% Al 2 O 3 , and 25-45% SiO.sub. 2, the sum of alkali metal oxide + Al.sub. 2 0 3 + SiO.sub. 2 constituting at least 80% of the total composition; c. 3-15% of at least one alkali metal oxide selected from the group consisting of Na 2 O and K 2 O, 30% B 2 O 3 , 55-80% SiO.sub. 2, and 1-15% F, the sum of alkali metal oxide + B 2 O 3 + SiO.sub. 2 + F constituting at least 80% of the total composition; and e. 5-25% of at least one alkali metal oxide selected from the group consisting of Na 2 O and K 2 O, 3-45% RO, wherein RO consists of MgO, CaO, SrO, and BaO, 45-85% SiO.sub. 2, and 0.5-5% F, the sum of alkali metal oxide + RO + SiO.sub. 2 + F constituting at least 80% of the total composition; said source glass being a lithium silicate composition containing at least 1% Li 2 O, and said sink glass being an alkali metal-free silicate composition.