EP0621826A1 - Multilayered glass laminate having enhanced resistance to penetration by high velocity projectiles - Google Patents

Multilayered glass laminate having enhanced resistance to penetration by high velocity projectiles

Info

Publication number
EP0621826A1
EP0621826A1 EP92910144A EP92910144A EP0621826A1 EP 0621826 A1 EP0621826 A1 EP 0621826A1 EP 92910144 A EP92910144 A EP 92910144A EP 92910144 A EP92910144 A EP 92910144A EP 0621826 A1 EP0621826 A1 EP 0621826A1
Authority
EP
European Patent Office
Prior art keywords
glass
laminate
thickness
polyester film
penetration
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP92910144A
Other languages
German (de)
French (fr)
Other versions
EP0621826A4 (en
Inventor
Charles Anthony Smith
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
EIDP Inc
Original Assignee
EI Du Pont de Nemours and Co
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by EI Du Pont de Nemours and Co filed Critical EI Du Pont de Nemours and Co
Publication of EP0621826A1 publication Critical patent/EP0621826A1/en
Publication of EP0621826A4 publication Critical patent/EP0621826A4/en
Withdrawn legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/06—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B17/00—Layered products essentially comprising sheet glass, or glass, slag, or like fibres
    • B32B17/06—Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material
    • B32B17/10—Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material of synthetic resin
    • B32B17/10005—Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material of synthetic resin laminated safety glass or glazing
    • B32B17/10009—Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material of synthetic resin laminated safety glass or glazing characterized by the number, the constitution or treatment of glass sheets
    • B32B17/10064—Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material of synthetic resin laminated safety glass or glazing characterized by the number, the constitution or treatment of glass sheets comprising at least two glass sheets, only one of which being an outer layer
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/36—Layered products comprising a layer of synthetic resin comprising polyesters
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B7/00—Layered products characterised by the relation between layers; Layered products characterised by the relative orientation of features between layers, or by the relative values of a measurable parameter between layers, i.e. products comprising layers having different physical, chemical or physicochemical properties; Layered products characterised by the interconnection of layers
    • B32B7/04—Interconnection of layers
    • B32B7/12—Interconnection of layers using interposed adhesives or interposed materials with bonding properties
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F41—WEAPONS
    • F41H—ARMOUR; ARMOURED TURRETS; ARMOURED OR ARMED VEHICLES; MEANS OF ATTACK OR DEFENCE, e.g. CAMOUFLAGE, IN GENERAL
    • F41H5/00—Armour; Armour plates
    • F41H5/02—Plate construction
    • F41H5/04—Plate construction composed of more than one layer
    • F41H5/0407—Transparent bullet-proof laminatesinformative reference: layered products essentially comprising glass in general B32B17/06, e.g. B32B17/10009; manufacture or composition of glass, e.g. joining glass to glass C03; permanent multiple-glazing windows, e.g. with spacing therebetween, E06B3/66
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/50—Properties of the layers or laminate having particular mechanical properties
    • B32B2307/56—Damping, energy absorption
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/50—Properties of the layers or laminate having particular mechanical properties
    • B32B2307/584—Scratch resistance
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/70—Other properties
    • B32B2307/732—Dimensional properties
    • B32B2307/734—Dimensional stability
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2571/00—Protective equipment
    • B32B2571/02—Protective equipment defensive, e.g. armour plates, anti-ballistic clothing

Definitions

  • This invention relates to glass laminates having enhanced resistance to penetration by high velocity projectiles. More particularly, the invention relates to relatively thin glass laminates which not only stop glass from spaUing when impacted by small and medium caliber bullets but also stops penetration of the laminates by the bullets or other small high velocity projectiles.
  • U.S. 3,658,636 thick plates of an amorphous polyamide are formed into a sandwich structure with silicate glass.
  • U.S. 2,861,021 describes a structure in which polymethyl methacrylate sheets are laminated with polyvinyl butyral and faced with a layer of a polyamide, polyester or regenerated cellulose sheet. Multiple plies of glass and polyvinyl butyral are used in combination with a plastic interlayer as an impact absorption section in the structure disclosed in U.S. 4,130,684.
  • This invention provides a laminated glazing to which is attached a permanent, energy absorbing thin plastic composite consisting of an adhesive energy absorbing layer, such as polyvinyl butyral, and a strong, dimensionally stable, chemical and abrasion resistant layer, such as a layer of polyester film which may be coated with a polysiloxane or other abrasion resistant coating.
  • the thin plastic composite prevents spalling from the surface of the glazing to which it has been laminated.
  • the composite increases the integrity and penetration resistance of the constructions to which it is laminated when they are impacted by bullets or other projectiles striking the opposite surface.
  • a multilayered glass laminate consisting of at least three plies of glass is prepared by interposing layers of plasticized polyvinyl butyral between the plies of glass.
  • the plies of glass each should have a thickness from about 1/8 to aboutl/4 inch (3.175 to 6.35 mm) and the polyvinyl butyral layer should have a thickness from about 15 to about 60 mils (0.381 to 1.524 mm).
  • a thin composite consisting of an adhesive layer of polyvinyl butyral having a thickness from 15 to 60 mils (0.381 to 1.524 mm) and a polyester film having a thickness from about 3 to about 15 mils (0.0762 to 0.381 mm) is permanently bonded to an outer layer of the glass.
  • the total thickness of the composite is not greater than about 2 mm.
  • Anti-spalling and penetration resistant structures having an overall reduction in thickness of 20% or more as compared to known glass laminates used in bullet resistant glazing applications are provided by this invention.
  • the relative thickness and number of plies of glass of the structures of this invention will be determined by the "threat level", i.e. the size and velocity of projectiles which are expected to be encountered.
  • the polyvinyl butyral adhesive sheeting may be selected from the many commercially available grades of plasticized polyvinyl butyral. a particularly desirable product of the type disclosed in Moynihan, US Patent 4,292,372 is sold by E. I. Du Pont de Nemours and Company under the trademark Butacite ® . Other known adhesive material for glass laminates such as polyurethane may also be used.
  • the polyester film may be of the type disclosed in Know, US Patent 4,072,779, and may be coated with an abrasion resistant material as disclosed in that patent.
  • the glass may be selected in accordance with ASTM specifications, Designation C 1172-91. The glass may be tempered or annealed. Tempered glass is generally preferred.
  • FIGS. 1 and 2 are sections through the edge of a projectile resistant laminate according to the invention.
  • a projectile resistant laminate comprises three sheets 10, 12, and 14 of glass.
  • Glass sheet 10 is positioned in a direction likely to receive an impact from a projectile, e.g. a bullet, on its face 11.
  • Sheets 10, 12, and 14 are bonded together by interlayers of polyvinyl butyral which are from 15 to 60 mils (0.381 to 1.528 mm) thick.
  • a polyethylene terephthalate film 24 from 3 to 15 mils (0.0762 to 0.381 mm) thick is bonded to glass sheet 14 by an interlayer of polyvinyl butyral.
  • FIG.2 shows the laminate of FIG. 1 having an abrasion resistant coating 26 adhered to the outer surface of polyethylene terephthalate film 24.
  • Coating 26 maybe a silanol coating from 1 to 20 microns thick of the type disclosed in US Pat.4,469,743 and US Pat. 4,177,315.
  • the laminated structure of this invention may be prepared by known laminating methods.
  • Polyvinyl butyral film is interleaved between glass sheets 10, 12 and 14.
  • a composite comprised of polyethylene terephthalate film 24 and polyvinyl butyral film 22 is then positioned over the rear face of glass sheet 14.
  • a coverplate is placed over the assembly, the assembly is edge taped and placed in an airtight bag and subjected to a vacuum. The evacuated assembly is then autoclaved while the bag is maintained under reduced pressure.
  • Laminated glass test panels were prepared by sandwiching polyvinyl butyral sheeting having a thickness of 30 mils (0.762 mm) between one foot (304.8 mm)squares of nominal 100 mil (2.54 mm) thick glass .
  • Selected panels included a composite bonded to an outer layer of one of the plies of glass consisting of a layer of a Butacite ® polyvinyl butyral sheet having a thickness of 15 mils (0.381 mm) and a polyester film having a thickness of 0.007 inch (0.178 m).
  • a Single shot from a .38 caliber handgun was fired at the center of each panel from a distance of 15 feet (4.572 m). Spall was measured as grams of glass ejecting from the backside of the laminate. Spall designated "+ + + " was not measured but was estimated to be in the range from about 50 to 100 grams, designated “+ + " in the range from 10 to 15 grams, and "+” less than about 0.2 grams. The results of the tests are set out in the following table. TABLE 1
  • Results similar to those obtained with 4 plies of glass plus a composite as shown above are obtained using 3 plies of glass plus a composite having a total thickness of about 12.5 mm.
  • Table 2 the data from Table 1 is condensed and reformated to show a percentage of penetration versus sample construction, thickness and the ratio of penetrations to the number of samples tested for each type. Focusing on the samples each with 4 phes of glass, the standard laminate was penetrated, whereas the sample having the same number of plies plus the composite shield is only penetrated 25% of the time. In tests where the composite was not penetrated, no spall was generated. This improvement resulted from the addition of a polyethylene terephthalate and polyvinyl butyral adhesive film of only 22 mils (0.559 mm) thick as compared to a glass laminate thickness of about 0.5 inch (12.7 mm) (an increase of 6.4% in thickness).

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Laminated Bodies (AREA)
  • Joining Of Glass To Other Materials (AREA)
  • Aiming, Guidance, Guns With A Light Source, Armor, Camouflage, And Targets (AREA)

Abstract

L'invention concerne un stratifié en verre multicouche ayant une résistance accrue à l'éclatement et à la pénétration par des projectiles à haute vitesse. Ce stratifié se compose d'au moins trois couches de verre (10, 12, 14) intercalées entre des couches de polybutyral de vinyle plastifié (16, 18, 20) et est pourvu d'un composite mince lié de façon permanente à une couche externe d'une des couches de verre (14) et qui est constitué par une couche adhésive absorbant l'énergie (22) et par un film polyester (24) aux dimensions stables.The invention relates to a multilayer glass laminate having increased resistance to bursting and penetration by high speed projectiles. This laminate consists of at least three layers of glass (10, 12, 14) interposed between layers of plasticized polyvinyl butyral (16, 18, 20) and is provided with a thin composite permanently bonded to a layer external of one of the glass layers (14) and which is constituted by an energy absorbing adhesive layer (22) and by a polyester film (24) with stable dimensions.

Description

TITLE MULTILAYERED GLASS LAMINATE HAVING ENHANCED RESISTANCE TO PENETRATION BY HIGH VELOCITY PROJECTILES
BACKGROUND OF THE INVENTION
This invention relates to glass laminates having enhanced resistance to penetration by high velocity projectiles. More particularly, the invention relates to relatively thin glass laminates which not only stop glass from spaUing when impacted by small and medium caliber bullets but also stops penetration of the laminates by the bullets or other small high velocity projectiles.
Various types of transparent laminated structures have been disclosed for protecting personnel from flying splinters and fragments of glazing materials which are released when a high velocity projectile strikes the structure. In U.S. 3,658,636 thick plates of an amorphous polyamide are formed into a sandwich structure with silicate glass. U.S. 2,861,021 describes a structure in which polymethyl methacrylate sheets are laminated with polyvinyl butyral and faced with a layer of a polyamide, polyester or regenerated cellulose sheet. Multiple plies of glass and polyvinyl butyral are used in combination with a plastic interlayer as an impact absorption section in the structure disclosed in U.S. 4,130,684.
The problem of spalling of an anti-abrasion layer which is applied to a laminate using polycarbonate sheets is addressed in U.S.4,812,359 by applying a thin polycarbonate sheet having an abrasion-resistant self-healing coating. A similar laminate which includes an internal elastic expansion core with a thin polycarbonate sheet covered with an antiabrasive which can be replaced is disclosed in U.S. 4,879,183. British Patent 828,381 discloses a five layer laminate consisting of two layers of glass, two layers of polyvinyl butyrate and a central layer of polyethylene terephthalate. Published UK Application 2 156 736A discloses an impact resistant laminate comprising a number of glass sheets which are laminated together with a rear polycarbonate sheet which is said to be resistant to spalling. A problem with most "bullet resistant" structures is that they have a thickness in excess of that which can be accommodated in usual glazing applications. Some structures are effective in conttolling spalling but are not effective in stopping penetration ofthe laminate by a projectile. Most of the structures rely on incorporating layers of various materials in the laminated structure. This complicates manufacture and increases costs since different materials require different laminating techniques.
It has been found that by permanently bonding a very thin composite consisting of an adhesive layer and a dimensionally stable polyester film to multiple plies of glass with layers of plasticized polyvinyl butyral there between, a glass laminate of substantially reduced thickness is provided which is capable of resisting penetration of high velocity projectiles with little, if any, spalling from the inner rear face of the laminate.
SUMMARY OF THE INVENTION
This invention provides a laminated glazing to which is attached a permanent, energy absorbing thin plastic composite consisting of an adhesive energy absorbing layer, such as polyvinyl butyral, and a strong, dimensionally stable, chemical and abrasion resistant layer, such as a layer of polyester film which may be coated with a polysiloxane or other abrasion resistant coating. The thin plastic composite prevents spalling from the surface of the glazing to which it has been laminated. Surprisingly, in addition to stopping glass from spalling, the composite increases the integrity and penetration resistance of the constructions to which it is laminated when they are impacted by bullets or other projectiles striking the opposite surface. By retaining the surface glass and holding the construction together, and by other mechanisms not fully understood, penetration resistance is substantially enhanced far beyond what would be expected of such a thin composite structure. In accordance with this invention a multilayered glass laminate consisting of at least three plies of glass is prepared by interposing layers of plasticized polyvinyl butyral between the plies of glass. The plies of glass each should have a thickness from about 1/8 to aboutl/4 inch (3.175 to 6.35 mm) and the polyvinyl butyral layer should have a thickness from about 15 to about 60 mils (0.381 to 1.524 mm). A thin composite consisting of an adhesive layer of polyvinyl butyral having a thickness from 15 to 60 mils (0.381 to 1.524 mm) and a polyester film having a thickness from about 3 to about 15 mils (0.0762 to 0.381 mm) is permanently bonded to an outer layer of the glass. The total thickness of the composite is not greater than about 2 mm. Anti-spalling and penetration resistant structures having an overall reduction in thickness of 20% or more as compared to known glass laminates used in bullet resistant glazing applications are provided by this invention. Preferably, three to seven plies of glass adhered together with adhesive layers of polyvinyl butyral are used, it is to be understood that the relative thickness and number of plies of glass of the structures of this invention will be determined by the "threat level", i.e. the size and velocity of projectiles which are expected to be encountered.
The polyvinyl butyral adhesive sheeting may be selected from the many commercially available grades of plasticized polyvinyl butyral. a particularly desirable product of the type disclosed in Moynihan, US Patent 4,292,372 is sold by E. I. Du Pont de Nemours and Company under the trademark Butacite®. Other known adhesive material for glass laminates such as polyurethane may also be used. The polyester film may be of the type disclosed in Know, US Patent 4,072,779, and may be coated with an abrasion resistant material as disclosed in that patent. The glass may be selected in accordance with ASTM specifications, Designation C 1172-91. The glass may be tempered or annealed. Tempered glass is generally preferred.
Brief Description of the Drawings FIGS. 1 and 2 are sections through the edge of a projectile resistant laminate according to the invention.
Detailed Description Referring to FIG. 1, a projectile resistant laminate comprises three sheets 10, 12, and 14 of glass. Glass sheet 10 is positioned in a direction likely to receive an impact from a projectile, e.g. a bullet, on its face 11. Sheets 10, 12, and 14 are bonded together by interlayers of polyvinyl butyral which are from 15 to 60 mils (0.381 to 1.528 mm) thick. A polyethylene terephthalate film 24 from 3 to 15 mils (0.0762 to 0.381 mm) thick is bonded to glass sheet 14 by an interlayer of polyvinyl butyral. FIG.2 shows the laminate of FIG. 1 having an abrasion resistant coating 26 adhered to the outer surface of polyethylene terephthalate film 24. Coating 26 maybe a silanol coating from 1 to 20 microns thick of the type disclosed in US Pat.4,469,743 and US Pat. 4,177,315.
The laminated structure of this invention may be prepared by known laminating methods. Polyvinyl butyral film is interleaved between glass sheets 10, 12 and 14. A composite comprised of polyethylene terephthalate film 24 and polyvinyl butyral film 22 is then positioned over the rear face of glass sheet 14. A coverplate is placed over the assembly, the assembly is edge taped and placed in an airtight bag and subjected to a vacuum. The evacuated assembly is then autoclaved while the bag is maintained under reduced pressure.
The invention will be further illustrated by the following examples.
EXAMPLES Laminated glass test panels were prepared by sandwiching polyvinyl butyral sheeting having a thickness of 30 mils (0.762 mm) between one foot (304.8 mm)squares of nominal 100 mil (2.54 mm) thick glass .
Selected panels included a composite bonded to an outer layer of one of the plies of glass consisting of a layer of a Butacite® polyvinyl butyral sheet having a thickness of 15 mils (0.381 mm) and a polyester film having a thickness of 0.007 inch (0.178 m). A Single shot from a .38 caliber handgun was fired at the center of each panel from a distance of 15 feet (4.572 m). Spall was measured as grams of glass ejecting from the backside of the laminate. Spall designated "+ + + " was not measured but was estimated to be in the range from about 50 to 100 grams, designated "+ + " in the range from 10 to 15 grams, and "+" less than about 0.2 grams. The results of the tests are set out in the following table. TABLE 1
Results similar to those obtained with 4 plies of glass plus a composite as shown above are obtained using 3 plies of glass plus a composite having a total thickness of about 12.5 mm.
In Table 2 the data from Table 1 is condensed and reformated to show a percentage of penetration versus sample construction, thickness and the ratio of penetrations to the number of samples tested for each type. Focusing on the samples each with 4 phes of glass, the standard laminate was penetrated, whereas the sample having the same number of plies plus the composite shield is only penetrated 25% of the time. In tests where the composite was not penetrated, no spall was generated. This improvement resulted from the addition of a polyethylene terephthalate and polyvinyl butyral adhesive film of only 22 mils (0.559 mm) thick as compared to a glass laminate thickness of about 0.5 inch (12.7 mm) (an increase of 6.4% in thickness). The same pattern can be seen for the samples each containing 5 plies of glass, where the number of data sets is greater. In this case, the addition of the composite reduces the penetration frequency from 40% to 0% with an increase of only 3.3% in thickness. It is obvious when comparing 5 plies of Standard Glass -Laminate that more protection is afforded when 4 plies ofthe same thickness of glass is used in the Composite Glass Laminate of the present invention. Even increasing the laininate thickness to 0.6 inch (15.24 mm), (5 plies of laminated glass) only reduced the actual penetration to 40% (a 27.7% increase in thickness).To obtain 0% penetration with the standard construction, 6 plies of glass were necessary.
TABLE 2

Claims

Claims
1. A multilayered glass laminate having enhanced resistance to spalling and penetration by high velocity projectiles consisting of at least three phes of glass with layers of plasticized polyvinyl butyral resin therebetween, said laminate having permanently bonded to an outer layer of one of said plies of glass a thin composite consisting of an adhesive, energy absorbing layer and a dimensionally stable, chemical resistant polyester film, said composite having a thickness not greater than about (2 mm), said polyester film having a thickness of from about 0.762 to 0.381mm.
2. The laminate of Claim 1 wherein said adhesive layer is plasticized polyvinyl butyral.
3. The laminate of Claim 2 wherein said adhesive layer has a thickness from about 0.381 to about 1.524 mm.
4. The laminate of Claim 3 wherein said polyester film has a thickness from about 0.0762 to about 0.381 mm.
5. The laminate of Claim 3 wherein said polyester film is coated with an abrasion resistant coating.
6. The laminate of Claim 3 consisting of from three to seven plies of glass.
AMENDED CLAIMS
[received by the International Bureau on 25 August 1993 (25.08.93) ; original claims 1-6 replaced by amended claims 1-3 (1 page)]
1. A multilayered glass laminate having enhanced resistance to spalling and penetration by high velocity projectiles consistmg of from three to seven plies of glass, each ply having a thickness from 3.175 to 6.35 mm, with layers of plasticized polyvinyl butyral resin therebetween, said laminate having permanently bonded to an outer layer of one of said plies of glass a thin composite consisting of an adhesive, energy absorbing layer and a dimensionally stable, chemical resistant polyester film, said composite having a thickness not greater than about 2 mm, said polyester film having a thickness of from about 0.762 to 0.381mm and said adhesive layer having a thickness from about 0381 to 1.524 mm.
2. The laminate of Claim 1 wherein said adhesive layer is plasticized polyvinyl butyral. 3. The laminate of Claim 2 wherein said polyester film is coated with an abrasion resistant coating.
EP92910144A 1991-11-27 1991-11-27 Multilayered glass laminate having enhanced resistance to penetration by high velocity projectiles. Withdrawn EP0621826A4 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
CA002123980A CA2123980A1 (en) 1991-11-27 1991-11-27 Multilayered glass laminate having enhanced resistance to penetration by high velocity projectiles
PCT/US1991/008751 WO1993010973A1 (en) 1991-11-27 1991-11-27 Multilayered glass laminate having enhanced resistance to penetration by high velocity projectiles
BR9107330A BR9107330A (en) 1991-11-27 1991-11-27 Multilayer glass laminate with superior resistance to shattering and penetration of projectiles at high speed

Publications (2)

Publication Number Publication Date
EP0621826A1 true EP0621826A1 (en) 1994-11-02
EP0621826A4 EP0621826A4 (en) 1995-04-26

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EP92910144A Withdrawn EP0621826A4 (en) 1991-11-27 1991-11-27 Multilayered glass laminate having enhanced resistance to penetration by high velocity projectiles.

Country Status (7)

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EP (1) EP0621826A4 (en)
JP (1) JP3073524B2 (en)
KR (1) KR100196753B1 (en)
AU (1) AU660677B2 (en)
BR (1) BR9107330A (en)
CA (1) CA2123980A1 (en)
WO (1) WO1993010973A1 (en)

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FI100009B (en) * 1994-10-20 1997-08-15 Tamglass Ltd Oy Method and apparatus for laminating glass sheets
EP1743765B1 (en) 2000-03-02 2013-08-14 Sekisui Chemical Co., Ltd. Interlayer film for laminated glass and laminated glass
KR100372374B1 (en) * 2000-10-30 2003-02-19 조동하 Manufacture method of bulletproof glass
KR101025474B1 (en) * 2008-11-26 2011-04-04 주식회사 휠코리아 Bullet proof glass
JP6070969B2 (en) * 2012-08-03 2017-02-01 コーニング インコーポレイテッド Multilayer transparent lightweight safety glazing

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FR2181635A1 (en) * 1972-04-24 1973-12-07 Ppg Industries Inc Laminated glass - protected from abrasion and bursting

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CA1024293A (en) * 1972-08-28 1978-01-10 E.I. Du Pont De Nemours And Company Polymeric film, laminated structures including such polymeric film and articles made from such laminated structures
US4242403A (en) * 1976-08-02 1980-12-30 Libbey-Owens-Ford Company Automotive glazing units and method of producing the same
US4956227A (en) * 1988-11-16 1990-09-11 Nippon Sheet Glass Co., Ltd. Laminated structure
US4952457A (en) * 1988-12-05 1990-08-28 Monsanto Company Laminated safety glass and polymeric laminate for use therein

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Publication number Priority date Publication date Assignee Title
FR2181635A1 (en) * 1972-04-24 1973-12-07 Ppg Industries Inc Laminated glass - protected from abrasion and bursting

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Title
See also references of WO9310973A1 *

Also Published As

Publication number Publication date
AU660677B2 (en) 1995-07-06
WO1993010973A1 (en) 1993-06-10
CA2123980A1 (en) 1993-06-10
AU1750492A (en) 1993-06-28
BR9107330A (en) 1996-01-02
JPH07503414A (en) 1995-04-13
EP0621826A4 (en) 1995-04-26
JP3073524B2 (en) 2000-08-07
KR100196753B1 (en) 1999-06-15

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