Method of using amorphous precipitated silica parting material f

Details Method of using amorphous precipitated silica parting material f Method of using amorphous precipitated silica parting material f

1990-12-28

1992-05-05

Lindsay, Robert L.

Glass manufacturing

Processes

Utilizing parting or lubricating layer

65106, 65107, 156276, 427154, C03B 4000, C03B 23023

Patent

active

051103362

ABSTRACT:
The number of bent laminated glass windshields having bull's-eyes that adversely affect its optical properties is reduced by using amorphous precipitated silica particles such as is used as flatting agents for paints, as a parting material between a pair of glass sheets during bending. The particles form relatively soft agglomerates that are milled and classified to produce a narrow distribution of particle sizes as compared to the distribution found in untreated silica, such as diatomaceous earths previously used as a parting material.

REFERENCES:
patent: 2314325 (1943-03-01), Binkert
patent: 2725320 (1955-11-01), Atkeson et al.
patent: 3071501 (1963-01-01), Cowley et al.
patent: 3918948 (1975-11-01), Monzi
patent: 4095994 (1978-06-01), Crawford et al.
patent: 4263051 (1981-04-01), Crawford et al.
patent: 4681750 (1987-07-01), Johnson et al.
patent: 4927802 (1990-05-01), Leatherman
PPG Lo-Vel HSF Silica Flatting Agent.
PPG Lo-Vel 27 Silica Flatting Agent Bulletins 87A, B, and C.
PPG Comparison Chart Silica Flatting Agents.

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