Method for the preparation of modified cellulose ethers

a technology of hydrophobic modification and cellulose ether, which is applied in the field of hydrophobic modification cellulose ether preparation, can solve the problems of long reaction time of manufacturing process, long reaction time of epoxy compound, hazardous to environment and health, etc., and achieves the effect of simple and quick

Inactive Publication Date: 2003-02-27
METSA SPECIALTY CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

0028] The manufacture of the hydrophobically modified cellulose ether according to the invention is simple and quick. Neither complex solvents nor long reaction times are needed. In addition, AKD is a safe chemical. It is neither combustible nor explosive; therefore, it neither causes a danger in a process nor is it dangerous to the environment. AKD is not hazardous or irritating and it does not cause allergies; therefore, it does not present any danger to the process personnel or the end-user.

Problems solved by technology

However, it is uncomfortable to use epoxy compounds because they are detrimental to health.
The alkyl reagent can be halide, halohydride, or epoxide, all of which are hazardous to environment and health.
This manufacturing process also has a long reaction time, 6 or up to 12 hours.

Method used

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  • Method for the preparation of modified cellulose ethers
  • Method for the preparation of modified cellulose ethers
  • Method for the preparation of modified cellulose ethers

Examples

Experimental program
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Effect test

example 1

[0030] 100 g of CMC (Metsa Speciality Chemicals) having an average molecular weight of 180 000 and a degree of substitution of 0.65 was put into a steel container. 1 g of alkylketene dimer dispersion having an AKD content of 10% by weight, diluted with 50 g of water, was sprayed on CMC, agitating the powder at the same time. The product was dried at 80.degree. C. to a moisture content of less than 8%. The AKD content of the end product was 0.1% by weight.

examples 2-6

[0031] By using the procedure described above, the following hydrophobically modified CMC samples (examples 2-6) were prepared:

1 TABLE 1 Molecular Degree of AKD content weight substitution in CMC, Example of CMC of CMC % by weight 2 60 000 0.72 0.05 3 300 000 0.80 0.05 4 220 000 0.87 0.1 5 305 000 1.15 1.0 6 80 000 0.75 0.01 Sample 5 contained 0.02% by weight of AKD which had reacted with CMC.

example 7

[0032] 100 g of CMC having an average molecular weight of 40 000 and a degree of substitution of 0.79 was put into a steel cylinder. 5 g of solid alkylketene dimer was added. The powder was agitated in an oven at 60.degree. C. for 120 minutes and at 105.degree. C. for 15 min. The AKD content of the end product was 5.0% by weight.

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Abstract

The invention relates to the preparation of a cellulose ether that is hydrophobically modified with an alkyl or alkenylketene dimer the general formula of which is in which R1 and R2 are alkyl or alkenyl chain, such as one having 5 to 22, preferably 13 to 20, most preferably 14 to 18 carbons. The product can be used in water-based products to control the rheological properties, for example. Objects of use include, for example, detergents, paper coating mixtures, paints, dispersing agents, and oil drilling muds.

Description

[0001] The invention relates to the preparation of hydrophobically modified cellulose ethers.[0002] Cellulose ethers, such as carboxymethyl cellulose, are employed in a wide variety of applications to treat the rheological properties of aqueous solutions in particular. Objects of use include, for example, foods, medicines, cosmetic preparations, detergents, agricultural chemicals, textiles, printing inks, paper coating agents, construction materials, adhesives, paints, ceramic materials, and additives of polymerisation.[0003] Cellulose ethers can be modified by attaching different substituents to hydroxyl groups in cellulose. In this way, the solubility or the hydrophobicity of cellulose ether in particular can be affected.[0004] There is a lot of literature concerning the hydrophobic modification of polysaccharides.[0005] U.S. Pat. No. 4,228,277 describes the modification of non-ionic cellulose ethers, such as methyl cellulose, methyl hydroxypropyl cellulose, hydroxypropyl cellulos...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): C08B11/20C08B13/00C11D3/22
CPCC08B11/20C08B13/00C11D3/225C11D3/226
Inventor LAHTEENMAKI, MIKKOKAHKONEN, HEIDIKLOOW, GORANRUPPERT, OLIVER
Owner METSA SPECIALTY CHEM
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