Automotive glazing structure

• US 3,900,673 A
• Filed: 09/13/1974
• Issued: 08/19/1975
• Est. Priority Date: 08/28/1972
• Status: Expired due to Term

• Current Assignee: LOF Glass Incorporated
• Original Assignee: John J. Hofmann, Paul T. Mattimoe, Siegfried H. Herliczek, Theodore J. Motter
• Inventors: Mattimoe, Paul T., Motter, Theodore J., Hofmann, John J., Herliczek, Siegfried H.
• Primary Examiner(s): Lesmes, George F.
• Assistant Examiner(s): Kendell, Lorraine T.
• Application Number:
  US05/505,830
• Time in Patent Office: 340 Days
• Field of Search: 161/190,194,199,231,257,404,2,183,1,189,206,402,204,165 156/99,106
• US Class Current: 428/339
• CPC Class Codes: B32B 17/10036 comprising two outer glass sheets
• CPC Class Codes: B32B 17/10091 thermally hardened
• CPC Class Codes: B32B 17/1033 Laminated safety glass or glazing containing temporary protective coatings or layers
• CPC Class Codes: B32B 17/10761 containing vinyl acetal
• CPC Class Codes: B32B 2367/00 Polyesters, e.g. PET, i.e. polyethylene terephthalate
• CPC Class Codes: B32B 27/08 of synthetic resin
• CPC Class Codes: B60J 1/02 arranged at the vehicle front , e.g. structure of the glazing, mounting of the glazing on windscreen mounted antenna wire H01Q1/1271
• CPC Class Codes: C03C 17/3405 with at least two coatings of organic materials C03C17/36, C03C17/42 take precedence
• CPC Class Codes: Y10T 428/269 including synthetic resin or polymer layer or component
• CPC Class Codes: Y10T 428/31 Surface property or characteristic of web, sheet or block
• CPC Class Codes: Y10T 428/3154 Of fluorinated addition polymer from unsaturated monomers

Abstract

An automobile windshield that incorporates, as part of its laminated structure, a protective laceration inhibiting cover or shield, bonded to its inboard glass surface and combining a penetration resisting multi-layer body with an exposed surface that is resistant to weathering and wear.

Claims

1. A TRANSPARENT, TEMPERATURE STABLE GLAZING STRUCTURE FOR AUTOMOTIVE VEHICLES THAT IS FREE OF APPARENT DISTORTION AND BIREFRINGENCE COLOR AND COMPRISES THE COMBINATION, WITH A SHEET OF GLASS THAT IS TO BECOME THE INBOARD GLASS SHEET WHEN SAID GLAZING STRUCTURE IS MOUNTED AND THAT HAS A SECOND SHEET OF GLASS HEAT AND PRESSURE LAMINATED TO A SURFACE THEREOF WITH AN INTERPOSED LAYER OF CONTROLLED RELATIVELY LOW ADHESION-HIGH PENETRATION RESISTANT PLASTIC, OF A RELATIVELY SOFT AND EXTENSIBLE BUT PENETRATION RESISTANT PROTECTIVE PLASTIC COVER THAT INCLUDES A LAYER OF RELATIVELY HIGH ADHESION PLASTIC SELECTED FROM THE GROUP CONSISTING OF POLYVINYL BUTYRAL, IONOMER RESIN, POLYURETHANE AND POLYVINYL CHLORIDE HEAT AND PRESSURE LMINATED TO THE SURFACE OF SAID INBOARD GLASS SHEET THAT IS TO BECOME THE INBOARD GLASS SURFACE OF SAID GLAZING STRUCTURE, A MORE DURABLE SHEET OF STRETCHED PLASTIC SELECTED FROM THE GROUP CONSISTING OF POLYETHYLENE TEREPHTHALATE, POLYURETHANE, CELLULOSE TRIACETATE, FLUORINATED COPOLYMERS OF ETHYLENE AND PROPYLENE, COPOLYMERS OF ACRYLIC ACID ESTERS, AND POLYVINYL FLUORIDE HAVING A THICKNESS OF 0.5 MIL TO 14 MILS ARRANGED WITH ITS MAJOR AXIS OF STRETCH AT RIGHT ANGLES TO THE HORIZONTAL DIMENSION OF SAID GLAZING STRUCTURE ON SAID RELATIVELY HIGH ADHESION PLASTIC LAYER, AND A RELATIVELY HARDER ABRASION RESISTANT COATING SELECTED FROM THE GROUP CONSISTING OF (A) MIXTURES OF POLYSILICIC ACID AND COPOLYMERS OF FLUORINATED MONOMERS WITH COMPOUNDS CONTAINING ALCOHOL GROUPS, AND (B) HYDROLYSIS AND CONDENSATION PRODUCTS OF METHYTRIETHOXY SILANE ON THE EXPOSED SURFACE OF SAID MORE DURABLE SHEET OF STRETCHED PLASTIC, THE COMBINED THICKNESS OF SAID INTERPOSED LAYER OF RELATIVELY LOW ADHESION PLASTIC AND SAID RELATIVELY HIGH ADHESION PLASTIC LAYER NOT EXCEEDING 0.065 INCH, AND THE COMBINED THICKNESS OF SAID PLASTIC SHEET AND SAID LYERS NOT EXCEEDING 0.075 INCH.

2. A glazing structure as defined in claim 1, in which the thickness of said more durable sheet of stretched plastic is between approximately 5 and 10 mils.

3. A glazing structure as defined in claim 1, in which said interposed layer of relatively low adhesion plastic and said relatively high adhesion plastic layer are comprised of polyvinyl butyral, said more durable sheet of stretched plastic is a sheet of polyethylene terephthalate that exhibits a tendency to split in the direction of its major axis of stretch, and said harder coating is a mixture of polysilicic acid and copolymers of fluorinated monomers with compounds containing alcohol groups.

4. A glazing structure as defined in claim 3, in which said harder coating is a mixture of polysilicic acid and copolymers of fluorinated monomers with compounds containing primary alcohol groups.

5. A glazing structure as defined in claim 3, in which said harder coating is a mixture of polysilicic acid and copolymers of fluorinated monomers with compounds containing secondary alcohol groups.

6. A glazing structure as defined in claim 1, in which said glass sheets are approximately 0.100 inch thick sheets of float glass, said interposed layer of relatively low adhesion plastic is an approximately 0.030 inch thick sheet of plasticized polyvinyl butyral, said relatively high adhesion plastic layer is an approximately 0.015 inch thick sheet of plasticized polyvinyl butyral, said more durable sheet of stretched plastic is an approximately 8 mil thick sheet of polyethylene terephthalate, and said harder coating is an approximately 4 micron thick precoating of a mixture of polysilicic acid and copolymers of fluorinated monomers with compounds containing alcohol groups on said sheet of polyethylene terephthalate.

7. A glazing structure as defined in claim 6, in which said precoating is a mixture of polysilicic acid and copolymers of fluorinated monomers with compounds containing primary alcohol groups.

8. A glazing structure as defined in claim 6, in which said precoating is a mixture of polysilicic acid and copolymers of fluorinated monomers with Compounds containing secondary alcohol groups.

9. A glazing structure as defined in claim 1, in which said sheet of stretched plastic comprises a frangible, asymmetrically oriented, dimensionally stabilized and optically transparent film structure of polyethylene terephthalate having an optical retardation of at least 5,000 millimicrons and a gauge deviation of less than 1% per inch along its surface.

10. A glazing structure as defined in claim 9, in which said polyethylene terephthalate film structure has an intrinsic viscosity of between 0.40 and 0.70 and a density of between 1.360 and 1.400.