Stock material or miscellaneous articles – Coated or structually defined flake – particle – cell – strand,... – Rod – strand – filament or fiber
Patent
1996-10-10
1999-03-16
Edwards, Newton
Stock material or miscellaneous articles
Coated or structually defined flake, particle, cell, strand,...
Rod, strand, filament or fiber
428390, 428391, 522 31, 522 42, 528481, 528524, D02G 300, C08F 246, C08F 600
Patent
active
058827927
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a sizing composition for glass threads, this composition reacting to ultraviolet radiation or to an electron beam. The present invention relates also to a process for the production of reinforcing glass threads using this composition, and also to the glass threads obtained and the composites produced starting from the threads.
2. Discussion of the Background
In the course of the text, "polymerisable", "polymerise", and "polymerisation" are to be understood as meaning, respectively, "polymerisable and/or crosslinkable", "polymerize and/or crosslink", and "polymerization and/or crosslinking". Likewise, "under U.V. or E.B." and "U.V. irradiation or E.B. exposure" are to be understood as meaning, respectively, "under the action of ultraviolet radiation or of an electron beam" and "irradiation by ultraviolet radiation or exposure to an electron beam".
The manufacture of reinforcing glass threads is effected in known manner starting from thin streams of molten glass flowing from the orifices of die plates. These thin streams are drawn in the form of continuous filaments and then the filaments are gathered into basic threads which are subsequently collected.
Before they are gathered in the form of threads, the filaments are coated with a size by being passed over a sizing member. The depositing of size is necessary in order to obtain the threads and enables the threads to be associated with other organic and/or inorganic materials in order to produce composites.
The size acts primarily as a lubricant and protects the threads from the abrasion resulting from the high-speed friction of the threads on various members during the above-mentioned process.
The size can also ensure, especially after polymerisation, the integrity of the above-mentioned threads, that is to say, the interconnection of the filaments within the threads. This integrity is especially desired in textile applications where the threads are subjected to great mechanical stresses. If the filaments are poorly integral with one another they break more easily and interfere with the operation of the textile machines. In addition, threads that do not exhibit integrity are considered to be difficult to handle.
The size also facilitates the wetting and/or impregnation of the threads with the materials to be reinforced and contributes to the creation of bonds between the said threads and materials. In particular, the mechanical properties of the composites obtained from the said materials and threads depend on the quality of the adhesion of the material to the threads and on the suitability of the threads for being wetted and/or impregnated by the material.
The sizing compositions used have to be sufficiently stable, especially under the die plate, and compatible with the drawing speeds of the filaments that have to pass through them (up to several tens of meters per second). In particular, they must be able to withstand the shearing induced by the passage of the filaments and must wet the surface of the filaments at the said speeds. It is also desirable for these compositions to exhibit a maximum degree of conversion after polymerisation (this degree corresponding to the ratio between the number of reactive groups that have reacted in the size after polymerisation and the number, in the size, of reactive groups that are capable of reacting, before polymerisation) in order to ensure, in particular, that glass threads having a constant quality are obtained (a size exhibiting a degree of conversion much lower than the expected theoretical degree being capable of changing over time).
The majority of sizes currently used are aqueous sizes which are easy to handle but which have to be deposited on the filaments in large quantities in order to be effective. Water generally constitutes 90% by weight of these sizes (in particular for reasons of viscosity), which makes it necessary to dry the threads before they are used as reinforcements, since the water may impair the good adhe
REFERENCES:
patent: 4042360 (1977-08-01), Kane
patent: 4099837 (1978-07-01), Vazirani
patent: 4156035 (1979-05-01), Tsao et al.
patent: 4987158 (1991-01-01), Eckberg
patent: 5057358 (1991-10-01), Riding et al.
patent: 5363468 (1994-11-01), Yoshikawa et al.
patent: 5486416 (1996-01-01), Johnson et al.
patent: 5539012 (1996-07-01), Klemarczyk et al.
Edwards Newton
Vetrotex France
LandOfFree
Sizing composition for glass threads, process using this composi does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Sizing composition for glass threads, process using this composi, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Sizing composition for glass threads, process using this composi will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-815852