Fire resistant glazing unit
AssigneePyroguard UK Limited
InventorsVincent Crook, Muhammad I. Ali
Life of this patent
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Abstract
The present invention relates to a fire resistant glazing unit (10), and in particular to novel curable gelling compositions which may form a fire-resistant hydrogel interlayer (3) between the glass panes (1) of the glazing unit (10). The gelling compositions of the invention comprise 5-40% w/w of a curable hydrogel-forming component (typically an acidic vinyl monomer such as acrylic acid or its metal salt); 20-60% w/w of one or more salts (e.g. magnesium salts); 40-90% w/w of an aqueous vehicle; and the gelling compositions have an acidic p H between p H 1 and 7. Such gelling compositions, when cured to form a hydrogel interlayer, provide excellent fire-resistant properties and also an excellent radiation barrier in the event of a fire.
Claims26
A gelling composition for forming a fire-resistant hydrogel interlayer within a glazing unit, the gelling composition obtained by mixing together:
- 5-40% w/w of a curable hydrogel-forming component;
- 20-60% w/w of one or more salts;
- and
- an aqueous vehicle;
- wherein the sum total of % w/w of all ingredients mixed together to obtain the gelling composition, including any further ingredients, is 100% w/w;
- characterised in that:
- the composition has a pH between 3 and 6.8;
- and
- the one or more salt(s) comprise monovalent or divalent metal cations or a combination thereof;
- the curable hydrogel-forming component comprises:
- a polymerisable hydrophilic monomer selected from the group consisting of acrylic acid, methacrylic acid, itaconic acid, vinylsulfonic acid, allylsulfonic acid, methallylsulfonic acid, styrenesulfonic acid, 2-acrylamide-2-phenylpropanesulfonic acid, 2-acrylamide-2-methyl-propanesulfonic acid, vinyl phosphoric acid, (meth)acrylate of ethylene oxide-modified phosphoric acid, N,N-dimethylaminoethyl methacrylate, N,N-diethylaminoethyl methacrylate, N,N-dimethylaminoethyl acrylate, N,N-dimethylaminopropylmethacrylamide, N,N-dimethylaminopropylacrylamide;
- or
- a polymerisable hydrophilic monomer defined by Formula (I):
- wherein R1 is H, or (1-2C)alkyl;
- R2 is selected from OH, OR3, NH2, NHR3, and NR3R4;
- and
- R3 and R4 are independently (1-2C)alkyl;
- or a salt thereof.
Dependencies are inferred from the claim text.