Glass fibres for reinforcing organic and/or inorganic materials

• US 6,136,735 A
• Filed: 09/02/1999
• Issued: 10/24/2000
• Est. Priority Date: 09/10/1997
• Status: Expired due to Term

• Current Assignee: Saint-gobain Fabrics Europe Co.
• Original Assignee: Vetrotex France SA
• Inventors: Creux, Sophie, Genechten, Jan Van, Gallo, Marcelo Hernan, Bazin, Jean-Paul, Fournier, Pascal
• Primary Examiner(s): GROUP, KARL E
• Application Number:
  US09/284,976
• Time in Patent Office: 418 Days
• Field of Search: 501/35, 501/36, 501/70, 65/459, 65/454
• US Class Current: 501/36
• CPC Class Codes: C03C 13/00 Fibre or filament compositions manufacture of fibres or filaments C03B37/00

Abstract

The present invention relates to reinforcing glass yarns, the composition of which comprises the following constituents within the limits defined hereinbelow, expressed in percentages by weight:

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SiO₂ 58 to 62% Al₂ O₃ 10 to 16% CaO more than 18% MgO more than 1.5% CaO + MgO less than 28% Na₂ O + K₂ O + Li₂ O less than 2% TiO₂ less than 1.5% Fe₂ O₃ less than 0.5% B₂ O₃ less than 2% F₂ less than 2% ______________________________________

this composition furthermore comprising less than 1% of other constituent(s) and comprising more than 0.5% of at least one of the three components F₂, B₂ O₃ and Li₂ O.

These yarns have a composition providing an excellent compromise between its cost and its fiberizability.

Claims

1. Reinforcing glass yarn, having a composition which comprises the following constituents, expressed in percentages by weight:

space="preserve" listing-type="tabular">______________________________________ SiO.sub.2 58 to 62% Al.sub.2 O.sub.3 10 to 16% CaO more than 18% MgO more than 1.5% CaO + MgO less than 28% Na.sub.2 O + K.sub.2 O + Li.sub.2 O less than 2% TiO.sub.2 less than 1.5% Fe.sub.2 O.sub.3 less than 0.5% B.sub.2 O.sub.3 less than 2% F.sub.2 less than 2% ______________________________________

the composition furthermore comprising less than 1% of other constituent(s) and comprising more than 0.5% of at least one of the three components F₂, B₂ O₃ and Li₂ O.

2. Glass yarn according to claim 1, wherein the glass forming the yarn has a viscosity of 10².5 poise at a temperature of between 1200 and 1380°

C. and a viscosity of 10³ poise at a temperature of between 1110 and 1290°

C.

3. Glass yarn according to claim 1, wherein the sum of the CaO and MgO contents is greater than 21% by weight, the CaO and MgO contents not exceeding 26 and 10% by weight, respectively.

4. Glass yarn according to claim 1, wherein the composition comprises, expressed in percentages by weight:

space="preserve" listing-type="tabular">______________________________________ SiO.sub.2 58.5 to 61% Al.sub.2 O.sub.3 11 to 14% CaO 21 to 23% MgO 2 to 3.5% Na.sub.2 O + K.sub.2 O + Li.sub.2 O 0.5 to 1.8% TiO.sub.2 0 to 1% Fe.sub.2 O.sub.3 0 to 0.4% B.sub.2 O.sub.3 up to 1.8% F.sub.2 up ta 1.8% ______________________________________

the composition furthermore comprising at least 0.7% of at least one of the three components F₂, B₂ O₃, Li₂ O and comprising less than 1% of other constituent(s).

5. Composite made of glass yarns defined by claim 1 and at least one organic or inorganic material.

6. Process for manufacturing glass yarns as defined in claim 1 comprising drawing a multiplicity of streams of molten glass flowing out of a multiplicity of orifices located at a base of one or more bushings, to form one or more bundles of continuous filaments, and combining the filaments into one or more yarns which are collected on a moving support.

7. Process according to claim 6, wherein the molten glass is obtained from raw materials, at least some of the said raw materials being waste of glass yarns.

8. Process according to claim 7, characterized in that the waste is waste of E glass yarns and/or is waste of a glass yarn which comprises the following constituents, expressed in percentages by weight:

space="preserve" listing-type="tabular">______________________________________ SiO.sub.2 58 to 62% Al.sub.2 O.sub.3 10 to 16% CaO more than 18% MgO more than 1.5% CaO + MgO less than 28% Na.sub.2 O + K.sub.2 O + Li.sub.2 O less than 2% TiO.sub.2 less than 1.5% Fe.sub.2 O.sub.3 less than 0.5% B.sub.2 O.sub.3 less than 2% F.sub.2 less than 2% ______________________________________

9. Process according to claim 7, wherein the waste represents from 0 to 35% by weight of the raw materials.

10. Glass composition adapted for making glass yarns used in reinforcement comprising the following constituents, expressed in percentages by weight:

space="preserve" listing-type="tabular">______________________________________ SiO.sub.2 58 to 62% Al.sub.2 O.sub.3 10 to 16% CaO more than 18% MgO more than 1.5% CaO + MgO less than 28% Na.sub.2 O + K.sub.2 O + Li.sub.2 O less than 2% TiO.sub.2 less than 1.5% Fe.sub.2 O.sub.3 less than 0.5% B.sub.2 O.sub.3 less than 2% F.sub.2 less than 2% ______________________________________

the composition furthermore comprising less than 1% of other constituent(s) and comprising more than 0.5% of at least one of the three components F₂, B₂ O₃ and Li₂ O.