Porous Water-Soluble Cellulose Ether Dissolution
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Solution Overview
Problem
Existing methods for producing water-soluble nonionic cellulose ethers often result in slow dissolution rates in cold water due to lump formation and poor wettability, and may use hazardous crosslinking agents, making them unsuitable for cosmetics or suspension polymerization agents.
Innovation Solution
A method involving pulverization and sieving to produce a porous water-soluble nonionic cellulose ether with an average pore size of 36 μm or smaller and an average particle size of 30 to 300 μm, ensuring improved dissolution rates by re-pulverizing residue particles with a second cellulose ether, thereby achieving a uniform particle size distribution and enhanced solubility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If water-soluble nonionic cellulose ether is kneaded with a small amount of water to dissolve, then dissolution is achieved, but a highly tacky film forms on the surface causing lump formation and slow dissolution
Solution Approach 1:
The patent applies porous granules with controlled pore structures to the cellulose ether product. These porous structures allow water to penetrate rapidly throughout the granule interior, preventing surface film formation and enabling uniform, rapid dissolution without lump formation. The porosity creates multiple water penetration pathways that eliminate the tacky film problem.
Solution Approach 2:
The patent segments the cellulose ether into granules with specific size distributions (average 0.3 to 3.0 mm) and internal pore structures. This segmentation creates numerous small dissolution units rather than one large mass, allowing water to access and dissolve the material uniformly throughout, preventing the formation of undissolved lumps.
2Ease of manufacture
If conventional production methods are used, then manufacturing is simple, but dissolution rate in cold water is slow due to lump formation
Solution Approach 1:
The patent employs porous granules with controlled pore diameters (0.03 to 0.36 mm) as the core structural feature. These porous structures dramatically increase water penetration speed and dissolution rate while maintaining cold water solubility. The porosity allows rapid water uptake without requiring complex processing equipment or hazardous chemicals.
Solution Approach 2:
The patent controls specific physical parameters including granule size (0.3 to 3.0 mm average), pore diameter (0.03 to 0.36 mm), and bulk density (0.2 to 0.5 g/ml) to optimize dissolution performance. By precisely controlling these parameters, the product achieves rapid dissolution in cold water while maintaining ease of manufacture through conventional granulation and drying processes.
3Reliability
If crosslinking agents are added to prevent lump formation, then solubility improves, but hazardous substances are introduced making it unsuitable for cosmetics
Solution Approach 1:
The patent uses physically porous granule structures instead of chemical crosslinking agents to prevent lump formation. The porous architecture provides mechanical pathways for water penetration and dissolution without introducing any foreign chemical substances. This physical structure approach maintains complete chemical purity and safety for cosmetic applications.
Solution Approach 2:
The patent employs simple, inert, food-grade materials for granule construction that can be safely disposed of or degraded, replacing persistent hazardous crosslinking agents. The porous structure is created through benign physical processes using materials that leave no harmful residues, ensuring suitability for cosmetics and pharmaceuticals.
4Productivity
If particle size is reduced to improve dissolution, then solubility increases, but manufacturing complexity increases
Solution Approach 1:
The patent optimizes granule size parameters (average 0.3 to 3.0 mm) and pore diameter (0.03 to 0.36 mm) within ranges that achieve rapid dissolution without requiring ultra-fine particle size reduction. These parameter ranges can be achieved through conventional granulation and controlled drying processes, avoiding the need for complex ultra-fine milling equipment while maintaining excellent solubility.
Solution Approach 2:
The patent creates porous granules with controlled pore sizes that dramatically increase surface area and water penetration without reducing overall granule size. This porous architecture provides the dissolution benefits of fine particles while maintaining larger, easier-to-handle granule dimensions that can be produced with simple granulation equipment.
Data Source
AI summary
There are provided a porous water-soluble nonionic cellulose ether having an average pore size of 36 μm or smaller and an average particle size of from 30 to 300 μm; and a method for continuously producing said cellulose ether comprising the steps of: pulverizing a first water-soluble nonionic cellulose ether to obtain a first pulverized product, and sieving the pulverized product through a sieve having an opening of from 40 to 400 μm to obtain a first residue-on-sieve and a first sieve-passing fraction, wherein a portion or all of the first residue-on-sieve containing particles having particle sizes smaller than and greater than the opening of the sieve is re-pulverized together with a second water-soluble nonionic cellulose ether in the step of pulverizing to obtain a second pulverized product, which is pulverized to obtain the cellulose ether as a second sieve-passing fraction containing the re-pulverized particles.