DE975660C - Process for the production of polyester-bonded glass fiber laminates with increased adhesive strength of the plastic layer on glass - Google Patents
Process for the production of polyester-bonded glass fiber laminates with increased adhesive strength of the plastic layer on glassInfo
- Publication number
- DE975660C DE975660C DEF11334A DEF0011334A DE975660C DE 975660 C DE975660 C DE 975660C DE F11334 A DEF11334 A DE F11334A DE F0011334 A DEF0011334 A DE F0011334A DE 975660 C DE975660 C DE 975660C
- Authority
- DE
- Germany
- Prior art keywords
- polyester
- glass
- unsaturated
- pretreated
- adhesive strength
- 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.)
- Expired
Links
Classifications
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J5/00—Manufacture of articles or shaped materials containing macromolecular substances
- C08J5/04—Reinforcing macromolecular compounds with loose or coherent fibrous material
- C08J5/06—Reinforcing macromolecular compounds with loose or coherent fibrous material using pretreated fibrous materials
- C08J5/08—Reinforcing macromolecular compounds with loose or coherent fibrous material using pretreated fibrous materials glass fibres
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C70/00—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts
-
- 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
- B32B17/10018—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 only one glass sheet
-
- 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
- B32B17/10165—Functional features of the laminated safety glass or glazing
- B32B17/10366—Reinforcements of the laminated safety glass or glazing against impact or intrusion
-
- 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
-
- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03C—CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
- C03C17/00—Surface treatment of glass, not in the form of fibres or filaments, by coating
- C03C17/28—Surface treatment of glass, not in the form of fibres or filaments, by coating with organic material
- C03C17/32—Surface treatment of glass, not in the form of fibres or filaments, by coating with organic material with synthetic or natural resins
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
- B29K2309/00—Use of inorganic materials not provided for in groups B29K2303/00 - B29K2307/00, as reinforcement
- B29K2309/08—Glass
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2367/00—Characterised by the use of polyesters obtained by reactions forming a carboxylic ester link in the main chain; Derivatives of such polymers
- C08J2367/06—Unsaturated polyesters
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Organic Chemistry (AREA)
- Health & Medical Sciences (AREA)
- Medicinal Chemistry (AREA)
- Polymers & Plastics (AREA)
- Manufacturing & Machinery (AREA)
- Composite Materials (AREA)
- Mechanical Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Chemical & Material Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Macromonomer-Based Addition Polymer (AREA)
- Adhesives Or Adhesive Processes (AREA)
Description
AUSGEGEBEN AM 12. APRIL 1962ISSUED APRIL 12, 1962
Bekanntlich werden die mechanischen Eigenschaften von vielen Kunststoffen durch die Mitverwendung von Fasermaterialien bedeutend erhöht. Als Fasermaterial nimmt die Glasfaser hierbei eine besondere Stellung ein, indem sie die Festigkeit von Kunststoffen, die beispielsweise durch Polymerisation von ungesättigten Polyestern mit Vinyl- oder Polyallylverbindungen oder durch Polykondensationsreaktionen hergestellt werden, bedeutend erhöht. Ein wesentlicher Nachteil dieser mit Glasfasern durchzogenen Polymerisate besteht darin, daß das Polymerisat an der Berührungsschicht mit der Glasfaser allmählich zerstört und der Kunststoff brüchig wird. Dieser Vorgang tritt besonders dann ein, wenn man das Material längere Zeit der Witterung aussetzt, so daß Spuren von Feuchtigkeit an die Berührungsfläche Glasfaser— Polymerisat gelangen können, wobei, offenbar durch Spuren von Alkali des Glases bedingt, eine örtliche Verseifung stattfindet. Zur Vermeidung dieser Nachteile ist es erforderlich, daß die Benetzbarkeit der Glasfaser mit der Lösung der ungesättigten Polyester in Vinylverbindungen derart ist, daß einerseits die Faser von einem homogenen Film umgeben und andererseits eine außerordentliche Haftfestigkeit zwischen der Glasfaser und dem Polymerisat erzielt wird.It is well known that the mechanical properties of many plastics are increased by using them of fiber materials significantly increased. As a fiber material, the glass fiber occupies a special position in that it has the Strength of plastics, for example by polymerizing unsaturated polyesters are made with vinyl or polyallyl compounds or by polycondensation reactions, significantly increased. There is a major disadvantage of these polymers with glass fibers in that the polymer at the contact layer with the glass fiber is gradually destroyed and the plastic becomes brittle. This process occurs especially when the material is used for a longer period of time Time of exposure to the elements, so that traces of moisture on the contact surface fiberglass- Polymer can get, apparently caused by traces of alkali of the glass, a local saponification takes place. To avoid these disadvantages, it is necessary that the wettability the glass fiber with the solution of the unsaturated polyester in vinyl compounds like this is that on the one hand the fiber is surrounded by a homogeneous film and on the other hand an extraordinary one Adhesion strength between the glass fiber and the polymer is achieved.
Zur Erhöhung der Haftfestigkeit ist es bekannt, die Glasfaser mit verschiedenen Präparationen vorzubehandeln, von denen sich besonders die Polyacrylsäureester sowie die Chromkomplexe der Acryl- oder Methacrylsäure bewährt haben.To increase the adhesive strength, it is known to apply various preparations to the glass fiber pretreatment, of which especially the polyacrylic acid esters and the chromium complexes of the Acrylic or methacrylic acid have proven their worth.
209 554/4209 554/4
Es wurde nun überraschend -gefunden, daß die Wirkung derartiger Verbindungen noch übertroffen
wird, wenn die Glasflächen mit Lösungen von ungesättigten, freie Carboxylgruppen tragenden,
mischpolymerisationsfähigen Polyestern vorbehandelt werden und auf dem so vorbehandelten
Glasfasermaterial in bekannter Weise ein Polyesterharz durch Polymerisation oder Polykondensation
erzeugt wird,
ίο Derartige Produkte, die als kettenverknüpfendes Glied im wesentlichen die Estergruppe enthalten,
können nach an sich bekannten Verfahren erhalten werden. Beispielsweise kondensiert man ein Gemisch
von mehrwertigen Alkoholen und mehrbasischen Carbonsäuren unter Anwendung solcher
Mengenverhältnisse, daß ein Polykondensationsprodukt mit freien Carboxylgruppen entsteht, oder
indem man unter Anwendung eines großen Überschusses an mehrwertigem Alkohol (bezogen auf
die angewandte Menge an Carbonsäuren) arbeitet, wobei ein Kondensationsprodukt mit sehr hohem
Hydroxylgehalt erhalten wird. An derartige gesättigte oder ungesättigte hydroxylgruppenhaltige
Kondensationsprodukte können dann in zweiter Phase ungesättigte oder gesättigte Dicarbonsäureanhydride
angelagert werden, wobei eine Veresterung unter Ringöffnung und Erhaltung der einen Carboxylgruppe eintritt. Besonders erwähnt
seien auch noch die wasserlöslichen Kondensationsprodukte, die beispielsweise durch Kondensation
von Polyäthylenglykolen mit mehrbasischen Carbonsäuren und anschließende Anlagerung von Dicarbonsäureanhydrid
erhältlich sind. Auch die durch teilweise Verseifung von Polyvinylacetat und anschließende Umsetzung mit Maleinsäureanhydrid
erhältlichen Estercarbonsäuren sind gut geeignet.It has now been found, surprisingly, that the effect of such compounds is even exceeded if the glass surfaces are pretreated with solutions of unsaturated, free carboxyl group-bearing, copolymerizable polyesters and a polyester resin is produced in a known manner by polymerization or polycondensation on the thus pretreated glass fiber material,
Such products, which essentially contain the ester group as a chain-linking link, can be obtained by processes known per se. For example, a mixture of polyhydric alcohols and polybasic carboxylic acids is condensed using proportions such that a polycondensation product with free carboxyl groups is formed, or by using a large excess of polyhydric alcohol (based on the amount of carboxylic acids used), with a condensation product very high hydroxyl content is obtained. In the second phase, unsaturated or saturated dicarboxylic acid anhydrides can then be added to saturated or unsaturated hydroxyl-containing condensation products of this type, with esterification taking place with ring opening and retention of one carboxyl group. Special mention should also be made of the water-soluble condensation products which can be obtained, for example, by condensation of polyethylene glycols with polybasic carboxylic acids and subsequent addition of dicarboxylic acid anhydride. The ester carboxylic acids obtainable by partial saponification of polyvinyl acetate and subsequent reaction with maleic anhydride are also very suitable.
Behandelt man nun die Glasfaser mit einer Lösung eines der so erhältlichen Präparate vor, so ist die Faser nach dem Verdampfen des Lösungsmittels von einem homogenen, lagerfähigen Film umgeben, der sich durch ein gutes Haftvermögen auszeichnet. Wird die so vorbehandelte Faser in Lösungen von ungesättigten polymerisationsfähigen Polyestern und Vinylverbindungen eingebettet, so entstehen nach der Zugabe von Polymerisationsbeschleunigern Polymerisate, in denen die Bindung Glas—Polymerisat außerordentlich fest ist und die auch bei längerem Aussetzen der Witterung oder bei Wasserlagerung die oben geschilderten Nachteile nicht mehr zeigen.If you now pre-treat the glass fiber with a solution of one of the preparations available in this way, so is the fiber after evaporation of the solvent from a homogeneous, storable film surrounded, which is characterized by good adhesion. Is the pretreated fiber in Solutions of unsaturated polymerizable polyesters and vinyl compounds embedded, see above After the addition of polymerization accelerators, polymers result in which the bond Glass polymer is extremely strong and the the disadvantages described above even with prolonged exposure to the weather or when stored in water no longer show.
Das neue Verfahren bietet also die Möglichkeit, an Stelle der vorher benutzten Präparationen Produkte zu verwenden, die infolge ihrer freien Carboxylgruppen eine außerordentliche Affinität zum Glas besitzen, unter normalen Bedingungen unverändert lagerfähig sind und in Kombination mit ungesättigten Polyestern und Vinylverbindungen in Gegenwart von Polymerisationsbeschleunigern an der Mischpolymerisation teilnehmen können und dadurch für eine feste Verankerung einerseits zum Glas hin, andererseits zu dem Polymerisat hin, sorgen.The new method offers the possibility of replacing the previously used preparations To use products that have an extraordinary affinity due to their free carboxyl groups to the glass, can be stored unchanged under normal conditions and in combination with unsaturated polyesters and vinyl compounds in the presence of polymerization accelerators can participate in the copolymerization and thus for a firm anchorage on the one hand towards the glass, on the other hand towards the polymer.
An Stelle der ungesättigten, polymerisationsfähigen, in Vinylverbindungen gelösten Polyester können auch solche ungesättigten polymerisationsfähigen Polyester, die bereits Carboxylgruppen tragen und die nach dem Verfahren des Patents 910124 hergestellt werden, verwandt werden. Werden in diese Produkte Glasfasern, die in der oben beschriebenen Art bereits mit ungesättigten, carboxylgruppenhaltigen Polyestern vorbehandelt sind, eingebettet, so werden besonders gute Effekte erzielt.Instead of the unsaturated, polymerizable polyesters dissolved in vinyl compounds those unsaturated polymerizable polyesters which already contain carboxyl groups can also be used and which are manufactured according to the process of patent 910124. Are in these products glass fibers, which in the manner described above are already with unsaturated, polyesters containing carboxyl groups are pretreated, embedded, so the effects are particularly good achieved.
Auf eine gut gereinigte und entfettete Glasplatte sprüht man eine i°/oige Lösung eines Polyesters, der in Äthylacetat gelöst und wie folgt hergestellt worden ist:A 100% solution of a polyester is sprayed onto a well-cleaned and degreased glass plate. which has been dissolved in ethyl acetate and prepared as follows:
222 Teile Phthalsäureanhydrid und 380 Teile eines oxäthylierten Trimethylolpropans von der OH-Zahl 800 werden, wie bekannt, bei 2100C kondensiert, gegen Ende unter Vakuum, bis eine Säurezahl von 2 und eine OH-Zahl von 230 erreicht ist. Hieran addiert man die der O Η-Zahl entsprechende Menge Maleinsäureanhydrid bei 1200 C (1 Stunde) und nimmt in Äthylacetat auf.222 parts of phthalic anhydride and 380 parts of an oxyethylated trimethylolpropane of OH number 800 are, as known, is condensed at 210 0 C, towards the end under vacuum until an acid number of 2 and reaches a OH number of 230. Adding thereto the number of O Η-corresponding amount of maleic anhydride at 120 0 C (1 hour) is taken up in ethyl acetate.
Nach der raschen Verflüchtigung des Lösungsmittels setzt man die Platte 1 Stunde lang einer Temperatur von 1000C aus. Anschließend wird eine 3 mm dicke Schicht einer mit 2 % Benzoylperoxyd katalysierten Mischung aus einem ungesättigten Polyester (hergestellt aus 1 Mol Maleinsäure, 1 Mol Phthalsäure und 2 Mol 1,3-Butylenglykol) und Styrol aufgebracht und nach Abdeckung mit einer nicht vorbehandelten, jedoch ebenfalls gereinigten Glasplatte 1 Stunde bei 900 C polymerisiert. Nach Beendigung der Polymerisation kann die nicht präparierte Glasabdeckplatte leicht angehoben werden, während die mit dem ungesättigten carboxylgruppenhaltigen Polyester vorbehandelte Glasplatte so fest mit der polymerisieren Polyesterharzschicht verbunden ist, daß beim gewaltsamen Versuch der Trennung Glasausriß erfolgt.After the solvent has rapidly evaporated, the plate is exposed to a temperature of 100 ° C. for 1 hour. Then a 3 mm thick layer of a 2% benzoyl peroxide-catalyzed mixture of an unsaturated polyester (made from 1 mole of maleic acid, 1 mole of phthalic acid and 2 moles of 1,3-butylene glycol) and styrene is applied and, after covering with a non-pretreated, but also cleaned glass plate for 1 hour at 90 0 C polymerized. After the end of the polymerization, the unprepared glass cover plate can be lifted slightly, while the glass plate pretreated with the unsaturated carboxyl-containing polyester is so firmly bonded to the polymerized polyester resin layer that the glass will be torn off if a violent attempt is made to separate it.
In einer Glasseidenspinnmaschine werden die Einzelfäden nach dem Austritt aus den Düsen zu einem Strang zusammengefaßt und an einem Bindemittelpolster vorbeigeführt, dem eine 5%igc Lösung eines carboxylgruppenhaltigen Polyesters, der wie folgt hergestellt ist, zugeführt wird:In a fiberglass spinning machine, the individual threads become closed after exiting the nozzles combined in a strand and led past a binding agent cushion to which a 5% igc Solution of a polyester containing carboxyl groups, which is produced as follows:
An 100 Teile eines ungesättigten Polyesters, der durch Umesterung von 1 Mol Maleinsäuredimethylester und 2 Mol Diäthylenglykol hergestellt wird, werden 66 Teile Maleinsäureanhydrid bei 1200 C addiert und dann mit Methylenchlorid aufgenommen. To 100 parts of an unsaturated polyester which is prepared by transesterification of 1 mol of maleic acid dimethyl ester and 2 moles of diethylene glycol, 66 parts of maleic anhydride are added at 120 0 C and then added with methylene chloride.
Nach dem Abdunsten des Lösungsmittels im Luftstrom werden die so präparierten Glasfaden gespult. Ein aus diesen Fäden hergestelltes Gewebe wird in zehn Lagen übereinandergelegt, mit einer katalysierten Mischung des ungesättigten Polyesters und Styrol (wie im Beispiel 1 angegeben) Übergossen und in einer ioo° C heißen Presse beiAfter the solvent has evaporated in a stream of air, the thus prepared glass threads are made spooled. A fabric made from these threads is laid one on top of the other in ten layers, with one catalyzed mixture of unsaturated polyester and styrene (as indicated in example 1) Poured over and put in a hot press at 100 ° C
2 kg/cm2 Druck 2 Minuten lang verpreßt. Durch die Faservorpräparierung wird eine gute Benetzung der Fasern durch das Polyesterharz erzielt und eine blasenfreie Platte erhalten, die sehr gute Festigkeitseigenschaften besitzt.2 kg / cm 2 pressure for 2 minutes. The fiber pre-preparation results in good wetting of the fibers by the polyester resin and a bubble-free sheet with very good strength properties is obtained.
Eine ebenso große Haftfestigkeit von ungesättigten Polyestern auf Glas wird erzielt, wenn man gemäß den Angaben vom Beispiel 1 eine Glasplatte mit einem ungesättigten carboxylgruppentragenden Polyester behandelt, der wie folgt hergestellt ist:An equally high adhesive strength of unsaturated polyesters on glass is achieved if according to the details of Example 1, a glass plate with an unsaturated carboxyl group-bearing Treated polyester made as follows:
An 478 Teilen eines ungesättigten Polyesters, der durch Umesterung von 228 Teilen Maleinsäuredimethylester und 310 Teilen Diglykol hergestellt wird, werden 196 Teile Maleinsäureanhydrid ι Stunde bei 1200 C addiert und dann in Äthylacetat aufgenommen. Die Weiterbehandlung erfolgt nach Beispiel 1.To 478 parts of an unsaturated polyester which is prepared by transesterification of 228 parts of dimethyl maleate and 310 parts of diglycol, 196 parts of maleic anhydride are added ι hour at 120 0 C and then taken up in ethyl acetate. The further treatment takes place according to example 1.
Claims (4)
USA.-Patentschrift Nr. 2 549 732.Considered publications:
U.S. Patent No. 2,549,732.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DEF11334A DE975660C (en) | 1953-03-13 | 1953-03-14 | Process for the production of polyester-bonded glass fiber laminates with increased adhesive strength of the plastic layer on glass |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE2865788X | 1953-03-13 | ||
DEF11334A DE975660C (en) | 1953-03-13 | 1953-03-14 | Process for the production of polyester-bonded glass fiber laminates with increased adhesive strength of the plastic layer on glass |
Publications (1)
Publication Number | Publication Date |
---|---|
DE975660C true DE975660C (en) | 1962-04-12 |
Family
ID=25973848
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
DEF11334A Expired DE975660C (en) | 1953-03-13 | 1953-03-14 | Process for the production of polyester-bonded glass fiber laminates with increased adhesive strength of the plastic layer on glass |
Country Status (1)
Country | Link |
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DE (1) | DE975660C (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE1194752B (en) * | 1959-12-22 | 1965-06-10 | Burns & Russell Co | Coverings for building blocks made of polyesters and fillers |
Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2549732A (en) * | 1950-04-15 | 1951-04-17 | Libbey Owens Ford Glass Co | Production of polymerized polyester resin materials of superior water resistance andelectrical properties |
-
1953
- 1953-03-14 DE DEF11334A patent/DE975660C/en not_active Expired
Patent Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2549732A (en) * | 1950-04-15 | 1951-04-17 | Libbey Owens Ford Glass Co | Production of polymerized polyester resin materials of superior water resistance andelectrical properties |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE1194752B (en) * | 1959-12-22 | 1965-06-10 | Burns & Russell Co | Coverings for building blocks made of polyesters and fillers |
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