Our comments to B Chemistry 2015 (airbag compositions)

The Chemistry version of Paper B (English, French, German) addressed airbag compositions.

New set of claims

1. Airbag composition comprising,
1. 20 to 50 wt.% of a fuel being selected from the group of tetrazole, aminotetrazole, nitrotetrazole, nitroaminotetrazole and triazole;
2. 30 to 70 wt.% of an oxidant being selected from alkali metal or alkaline earth metal nitrate, chlorate or perchlorate;
3. 10 to 20 wt. % of a slag forming agent comprising a carbide of boron, aluminium or silicon, in which the slag forming agent comprises hydrotalcite as a secondary slag forming agent which is added in a weight ratio of 1:5 to 5:1 with respect to the carbide, and wherein the fuel is in the form of fuel particles having a size of 5 to 80 µm.
2. Airbag composition according to claim 1, wherein the slag forming agent comprises a carbide of aluminium or silicon.
3. Process for making the airbag composition according to claim 1 or 2 comprising the steps:
1. mixing the slag forming agent and hydrotalcite;
2. adding the other ingredients;
3. pressing for at least 5 minutes the mixture as obtained in step (iii) into pellets;
4. heat treating the pellets at a temperature between 80 and 120 ˚C for at least 10 hours.
4.  Airbag comprising the airbag compositions according to claim 1 or 2.

Amendments

The amendment in claim 1 as suggested by the Applicant finds no basis in the application as filed, since there is only basis for hydrotalcite in combination with a carbide as slag forming agent, not nitride. In this respect reference is made to original claim 3 and [011], lines 4-5 of the application as originally filed.

The same reasoning applies to the amended process claim.

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Lex

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