Polyurethane-based anhydrous sizing compositions for glass fibres, glass fibres obtained and composite materials comprising said fibres
The invention relates to a sizing composition consisting of a solution comprising less than 5% by weight of solvent and comprising a curable base system, said system comprising at least 50% by weight of a mixture of: one or more components containing at least one isocyanate reactive functional group; one or more components containing at least one hydroxyl reactive functional group; and optionally, one or more components containing at least one amine reactive functional group. A subject of the invention is also the glass strands coated with the aforementioned sizing composition. The glass strands obtained can be used to reinforce organic or inorganic materials.
1 . A glass strand coated with a sizing composition consisting of a solution comprising less than 5% by weight of solvent and comprising a curable base system, said system comprising at least 50% by weight of a mixture of:
one or more components comprising at least one isocyanate reactive functional group;
one or more components comprising at least one hydroxyl reactive functional group; and
optionally, one or more components comprising at least one amine reactive functional group.
2 . The glass strand as claimed in claim 1 , wherein the curable base system represents 60 to 100% by weight of the composition.
3 . The glass strand as claimed in claim 2 , in that wherein the base system represents 75 to 90% by weight of the composition.
4 . The glass strand as claimed in claim 1 , wherein the base system consists of 75% and up to 100% by weight of one or more isocyanate components, one or more hydroxyl components and one or more amine components.
5 . The glass strand as claimed in claim 1 , wherein the base system comprises at least 70% by weight of one or more components of molecular mass less than 750.
6 . The glass strand as claimed in claim 1 , wherein the ratio r of the number of isocyanate reactive sites to the number of hydroxyl reactive sites is between 0.1 and 6.
7 . The glass strand as claimed in claim 1 , wherein the ratio r′ of the number of isocyanate reactive sites to the sum of the number of hydroxyl reactive sites and of the number of amino reactive sites is between 0.1 and 6.
8 . The glass strand as claimed in claim 1 , wherein the content of isocyanate component(s) is between 10 and 50%, by weight of the sizing composition.
9 . The glass strand as claimed in claim 1 , wherein the content of hydroxyl component(s) is between 15 and 55%, by weight of the sizing composition.
10 . The glass strand as claimed in claim 1 , wherein the content of amine component(s) is less than or equal to 30%, by weight of the sizing composition.
11 . The glass strand as claimed in claim 1 , wherein the composition comprises from 0 to 5% by weight of a catalyst.
12 . The glass strand as claimed in claim 1 , wherein the composition comprises from 0 to 30% by weight of a coupling agent.
13 . The glass strand as claimed in claim 1 , wherein the composition comprises from 0 to 30% by weight of a textile processing aid.
14 . The glass strand as claimed in claim 1 , wherein the base system consists of one or more isocyanate components comprising at least two isocyanate reactive functional groups, one or more hydroxyl components comprising at least one hydroxyl reactive functional group and, optionally, one or more amine components comprising at least one amine reactive functional group.
15 . The glass strand as claimed in claim 14 , wherein the base system consists of one or more isocyanate components comprising three isocyanate reactive functional groups and one or more hydroxyl components comprising one to three hydroxyl reactive functional groups.
16 . The glass strand as claimed in claim 14 , wherein the base system consists of one or more isocyanate components comprising three isocyanate reactive functional groups, one or more hydroxyl components comprising a hydroxyl reactive functional unit and one or more amine components comprising two primary amine reactive functional groups.
17 . A sizing composition, consisting of a solution comprising less than 5% by weight of solvent and comprising a curable base system, said system comprising at least 50% by weight of a mixture of:
one or more components comprising at least one isocyanate reactive functional group;
one or more components comprising at least one hydroxyl reactive functional group; and
optionally, one or more components comprising at least one amine reactive functional group.
18 . A composite comprising at least one organic and/or inorganic material and sized glass strands, wherein all or some of the glass strands comprises the glass strand as claimed in claim 1 .
19 . (canceled)
20 . A method for forming a cloth, said method comprising forming said cloth which comprises said glass strand as claimed in claim 1.