Silicone Particles Crosslinked With Alkylene Groups

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Solution Overview

Problem

Silicone particles tend to aggregate over time, leading to poor dispersibility and reduced functionality in cosmetic and resin applications, with existing methods failing to effectively control oil absorption properties and maintain storage stability.

Innovation Solution

The development of silicone particles with a hydrogen content of 300 ppm or less, crosslinked using an alkylene group with 4 to 20 carbon atoms, and a specific molar ratio of alkenyl groups to hydrogen atoms, which are produced through a method involving an organopolysiloxane and a silicon organic compound, enhancing dispersibility and storage stability.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Volume of moving object

If silicone particles are produced by curing reaction of particulate matter, then small particle size is achieved, but aggregation over time occurs

Engineering Contradiction:
Improveparticle sizeVSAvoidaggregation resistance
Core Design Contradiction:
Volume of moving objectVSStability of the object's composition

Solution Approach 1:

The patent applies parameter changes by controlling the hydrogen content to 300 ppm or less and specifying the alkylene group carbon number (4-20) in the crosslinking structure. These parameter changes modify the chemical composition and bonding characteristics of the silicone particles, resulting in enhanced stability and resistance to aggregation over time while maintaining small particle size.

Inventive Principle:
Principle #35Parameter changes

2Adaptability or versatility

If organic compound is added during formation, then cosmetic raw material utility is improved, but insufficient incorporation and time-dependent aggregation occur

Engineering Contradiction:
Improvecosmetic raw material utilityVSAvoidstorage stability
Core Design Contradiction:
Adaptability or versatilityVSStability of the object's composition

Solution Approach 1:

The patent achieves sufficient incorporation of organic compounds by controlling the hydrogen content parameter (300 ppm or less) and the crosslinking structure (alkylene group with 4-20 carbon atoms). This parameter control ensures that organic compounds are adequately incorporated during formation, preventing both insufficient incorporation and time-dependent aggregation, thereby maintaining storage stability while preserving cosmetic raw material utility.

Inventive Principle:
Principle #35Parameter changes

3Productivity

If strong aggregation properties are present, then particle formation is enhanced, but dispersibility in solvent deteriorates

Engineering Contradiction:
Improveparticle formation efficiencyVSAvoiddispersibility
Core Design Contradiction:
ProductivityVSEase of operation

Solution Approach 1:

The patent resolves the contradiction between particle formation efficiency and dispersibility by precisely controlling the hydrogen content (300 ppm or less) and the crosslinking structure (alkylene group with 4-20 carbon atoms). These parameter changes enable the silicone particles to maintain appropriate aggregation properties during formation while ensuring good dispersibility in solvents, allowing both efficient particle formation and easy dispersion to be achieved.

Inventive Principle:
Principle #35Parameter changes

4Quantity of substance

If temperature control is used to control oil absorption, then oil absorption properties are adjusted, but extended control period is required

Engineering Contradiction:
Improveoil absorption propertiesVSAvoidcontrol period
Core Design Contradiction:
Quantity of substanceVSLoss of time

Solution Approach 1:

The patent eliminates the need for extended temperature control periods by changing the fundamental parameter of hydrogen content to 300 ppm or less and establishing a specific crosslinking structure with alkylene groups (4-20 carbon atoms). This parameter change inherently controls the oil absorption properties during the formation process itself, eliminating the need for subsequent extended temperature control while achieving the desired oil absorption characteristics.

Inventive Principle:
Principle #35Parameter changes

Applied Scientific Principles

This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.

Function Achieved in This Case

The resulting silicone particles exhibit low aggregation, improved tactile sensation, and enhanced functionality in cosmetics and resins, with a method that efficiently produces particles with improved dispersibility and storage stability.

Implementation Method 1

the silicon atom in the siloxane as a component for silicone particles is crosslinked with the other silicon atom via an alkylene group having a carbon number of 4 to 20

Methodology Applied
Scientific EffectCrosslinking: Chemical Bonding

Implementation Method 2

silicone particles are obtained by curing an addition reaction-curable silicone composition

Methodology Applied
Scientific EffectAddition reaction: Chemical Bonding

Data Source

PatentUS11643505B2Silicone particles, and cosmetic, coating, and resin formulated using same
Publication Date: 2023.05.09 DOW TORAY CO LTD

AI summary

Silicone particles having excellent dispersibility are provided via the method herein. A cosmetic material having excellent feeling of use, and a highly functional paint and an electronic material are also provided. The silicone particles include a siloxane as a component. A content of a hydrogen atom bonded to a silicon atom per unit mass is 300 ppm or less, or optionally is 20 ppm or less. In addition, the silicon atom in the siloxane as a component for the silicone particles is crosslinked with another silicon atom via an alkylene group having a carbon number of 4 to 20.