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US 4,304,906 AGranted
Heteropolysaccharide S-84
AssigneeMerck & Co., Inc.
InventorsKenneth S. Kang, George T. Veeder
Life of this patent
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Abstract
The new heteropolysaccharide S-84, prepared by fermentation of an unnamed Pseudomonas species, ATCC 31562 has valuable properties as a thickening, suspending and stabilizing agent in aqueous systems. It is especially useful in formulating explosive gels. Its chemical composition is within the following weight ranges of sugars: 8-15% glucuronic acid; 40-50% glucose; 35-45% mannose; 5-15% rhamnose; and 3-9% arabinose; it also contains 1-5% acetyl and 2-7% pyruvate groups.
Claims2
Heteropolysaccharide S-84, prepared by fermentation under controlled conditions of culture ATCC 31562, a Pseudomonas species;
- said S-84 containing 8-15% glucuronic acid, and the neutral sugars:
- mannose, glucose, rhamnose and arabinose in the approximate molar ratios of 35-45%;
- 40-50%;
- 5-15%;
- and 3-9%, respectively;
- 1-5% O-acetyl groups;
- 2-7% pyruvate groups and having the following physical properties:
- a 1% viscosity (measured on Brookfield Spindle No. 3) at 60 rpm of 800 cPs, at 6 rpm of 4,700 cPs;
- the gum being incompatible (precipitating) in ammonium polyphosphate;
- and compatible in CaCl.sub.2 (saturated);
- 60% NH.sub.4 NO.sub.3 ;
- 1% Al.sub.2 (SO.sub.4).sub.3.18H.sub.2 O;
- 1% CaCl.sub.2.2H.sub.2 O, and 1% KCl;
- and having viscosity measurements on a Wells-Brookfield microviscometer Model RVT-cP at 9.6 sec.sup.-1 in 0.1% KCl of 998 cPs and in 2.5 KCl of 1,360 cPs.
11 more elements
Dependencies are inferred from the claim text.