Block Copolymer Composition for Selective Surface Modification

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Solution Overview

Problem

Conventional methods struggle to form fine patterns on semiconductor devices due to optical limitations, and existing base agents lack sufficient base material selectivity and brush density for selective surface modification, as well as adequate heat resistance during self-assembly processes.

Innovation Solution

A composition comprising a polymer with specific block structures derived from styrene and acrylate units, capable of forming a polymer brush with high selectivity and density, and exhibiting good heat resistance, is used for selective modification of surfaces with multiple material regions.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Manufacturing precision

If conventional lithography methods are used, then existing techniques can be applied, but it is technically difficult to form finer patterns due to optical factors

Engineering Contradiction:

Improvepattern finenessVSAvoidoptical limitation

Core Design Contradiction:

Manufacturing precisionVSReliability

Solution Approach 1:

The patent replaces conventional optical lithography with a self-assembly mechanism using block copolymers. The phase separation structure of the block copolymer forms fine patterns through spontaneous organization rather than optical projection, overcoming the optical resolution limit and enabling pattern formation at dimensions below 30 nm.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Solution Approach 2:

The block copolymer performs self-assembly through its inherent phase separation behavior. The incompatible blocks spontaneously organize into periodic structures without requiring external patterning tools, enabling autonomous formation of fine patterns that conventional lithography cannot achieve.

Inventive Principle:

Principle #25Self-service

2Ease of operation

If a polymer brush is used for selective modification, then surface modification capability is improved, but good base material selectivity and high brush density have not been achieved

Engineering Contradiction:

Improvesurface modification capabilityVSAvoidbase material selectivity and brush density

Core Design Contradiction:

Ease of operationVSManufacturing precision

Solution Approach 1:

The polymer is divided into functionally distinct blocks: Block A1 provides base material selectivity through specific interactions with target surfaces, while Block A2 forms the brush structure with high density. This segmentation allows each block to optimize its function independently, achieving both selectivity and brush density that cannot be obtained with homogeneous polymers.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The patent uses a composite block copolymer structure combining different polymer blocks with complementary functions. Block A1 (styrene or acrylate-based) provides selective adhesion to base materials, while Block A2 (with formula (1) groups) forms a dense brush layer, creating a material that exhibits both selectivity and high brush density simultaneously.

Inventive Principle:

Principle #40Composite materials

3Manufacturing precision

If high-temperature annealing treatment is performed for self-assembly, then block copolymer organization is improved, but the base agent requires good heat resistance

Engineering Contradiction:

Improveself-assembly organizationVSAvoidheat resistance requirement

Core Design Contradiction:

Manufacturing precisionVSTemperature

Solution Approach 1:

The patent selects polymer components with appropriate thermal stability parameters. Block A1 uses styrene or acrylate units that maintain structural integrity at annealing temperatures, while Block A2 employs groups represented by formula (1) that are thermally stable. This parameter selection ensures the base agent withstands high-temperature self-assembly processes without degradation.

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 composition achieves high brush density and maintains stability under high temperatures, ensuring effective selective modification and pattern formation on surfaces with diverse materials.

Implementation Method 1

a polymer brush using a polymer having an adsorptive terminal group has been developed

Methodology Applied

Scientific EffectAdsorption: Adsorption

Implementation Method 2

a technique has been developed for forming a finer pattern by utilizing a phase separation structure formed by self-assembly of a block copolymer

Methodology Applied

Scientific EffectSelf-assembly: Self-Assembly

Implementation Method 3

phase separation structure formed by self-assembly of a block copolymer

Methodology Applied

Scientific EffectPhase separation: Phase Change

Data Source

PatentUS20260002001A1Composition and polymer

Publication Date: 2026.01.01 TOKYO OHKA KOGYO CO LTD

AI summary

A composition for selective modification of a base material having a surface containing two or more regions that are different in material from each other, the composition including a polymer and a solvent. The polymer has a block (A1) and a block (A2; the block (A1) has a constituent unit derived from at least one of styrene, a styrene derivative, and an (α-substituted) acrylate; the block (A2) having two or more groups represented by the following formula (1)in which X represents a single bond or an oxygen atom, and R1 represents an alkyl group, and the group represented by the formula (1) is bonded to a carbon atom.