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| Conditioning system for transducer signals |
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| Ink injection type writing system using amplitude-modulated electrical signals |
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| Ink-drop print-head |
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| Liquid jet device with cleaning protective means |
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| Ink jet printing apparatus and process |
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Self-extinguishing polymers
| Details |
Inventors: Ciaperoni, Aldemaro; Cucinella, Antonino;
Assignee: Sniaviscosa Societa Nazionale Industria Applicazioni Viscosa, S.p.A. (Milan, IT)
Primary Examiner: Taylor; Hosea E.
Assistant Examiner: White; R. A.
Attorney, Agent or Firm: Burgess, Ryan and Wayne
A new composition is described comprising a synthetic, artificial or natu polymer and a flameproofing additive imparting self-extinguishing properties to the composition and to the articles, such as moulded, spun or woven articles, made therefrom, said additive being the product of the reaction of melamine with acidic compounds, such as organic acids or anhydrides and inorganic acids. The process for making said additive by said reaction, preferably in the presence of water, is also described. The said composition may be made by introducing said additive in any manufacturing stage, viz. to the monomers (if the polymer is a synthetic one), to the molten polymer, to polymer solutions such as viscose dope, to polymer chips during extrusion, or to finished products e.g. by applying a finish to fabrics. |
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DETAILED DESCRIPTION OF PREFERRED EMBODIMENTS The following examples illustrate but do not limit the present invention.
Examples 1,2,17,19 and 20, refer to the preparation of a product (A) according to the invention, while the remaining examples refer to the preparation of the compositions based on the self-extinguishing polymeric compositions and to the inflammability tests relative thereto.
All the parts are by weight unless otherwise stated.
EXAMPLE 1 Preparation of a self-extinguishing product (A), obtained by the reaction in an aqueous medium of melamine and acetic anhydride in equimolecular amounts 189.
2 parts of melamine and 153.
1 parts of acetic anhydride are suspended in 1500 parts of water in a suitable reactor provided with a stirrer; the suspension is heated to 175.
degree.
C.
in a nitrogen atmosphere.
The heating is continued for 20 hours at the said temperature; the pressure rises to 8-9 atmospheres.
The product is filtered and is washed twice with 2000 parts of water heated to 90.
degree.
C.
, whereby 113 parts of a white product (A) are obtained.
On the product (A) thus obtained, the following determinations are carried out: Melting Point, above 320.
degree.
C.
; Solubility in water 0.
4 gr/lt at 20.
degree.
C.
; Elemental analysis: C=27.
4%, H=3.
5%, N=49.
1%; Equivalent weight determined by titration with sodium hydroxide 156.
5; Equivalent weight determined by titration with perchloric acid in acetic acid 132.
2.
The infrared spectrum shows main absorptions at 3470 cm.
sup.
-1, 2720-2690 cm.
sup.
-1, 1720 cm.
sup.
-1, 1630 cm.
sup.
-1, 1515 cm.
sup.
-1, 1190 cm.
sup.
-1, 980 cm.
sup.
-1, 785 cm.
sup.
-1, 540 cm.
sup.
-1, 440 cm.
sup.
-1.
EXAMPLE 2 Preparation of a modified self-extinguishing product (A), obtained by the reaction in an aqueous medium of melamine and acetic anhydride in equimolecular amounts in the presence of caprolactam 189.
2 parts of melamine, 153.
1 parts of acetic anhydride, 12.
73 parts of caprolactam and 1500 parts of water are added to one another in the reactor used in Example 1
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