DBDCB and ZPT Biocidal Composition Synergy

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Solution Overview

Problem

The existing biocidal formulations using 1,2-dibromo-2,4-dicyanobutane (DBDCB) and zinc pyrithione (ZPT) face challenges due to their high lipophilicity, leading to economically unfavorable use concentrations and exceeding regulatory limits when combined with other biocides like BIT, which reduces their antimicrobial effectiveness.

Innovation Solution

A composition comprising DBDCB and ZPT in specific synergistic ratios, preferably between 100:1 to 1:100 by weight, with at least 60% of the active components dissolved, optionally combined with additional biocidal active ingredients such as BIT, IPBC, or OIT, and additives like ZnO, to enhance antimicrobial efficacy while reducing required concentrations.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If DBDCB is used at higher concentrations to overcome its high lipophilicity, then antimicrobial effectiveness is improved, but economic favorability deteriorates

Engineering Contradiction:

Improveantimicrobial effectivenessVSAvoiduse concentration

Core Design Contradiction:

ReliabilityVSQuantity of substance

Solution Approach 1:

The patent combines DBDCB with ZPT in a synergistic mixture where the two biocidal active ingredients work together to enhance antimicrobial effectiveness. This combination allows achieving the desired preservation effect at lower overall concentrations of active ingredients, thereby improving economic favorability while maintaining reliability.

Inventive Principle:

Principle #5Merging (Combining)

2Reliability

If BIT is added to enhance antimicrobial spectrum, then broad-spectrum effectiveness is improved, but regulatory compliance deteriorates due to exceeding maximum permitted BIT amounts

Engineering Contradiction:

Improveantimicrobial spectrumVSAvoidregulatory limit violation

Core Design Contradiction:

ReliabilityVSObject-affected harmful factors

Solution Approach 1:

The patent uses ZPT as an intermediary biocidal active ingredient that complements DBDCB's antimicrobial spectrum without requiring excessive BIT. The ZPT component provides additional coverage against bacteria, molds, yeasts and algae, thereby broadening the spectrum while avoiding regulatory limit violations associated with high BIT concentrations.

Inventive Principle:

Principle #24Intermediary (Mediator)

3Ease of manufacture

If ZPT is used as sole biocidal active ingredient, then ease of formulation is improved, but antimicrobial effectiveness deteriorates due to high lipophilicity

Engineering Contradiction:

Improveformulation simplicityVSAvoidantimicrobial effectiveness

Core Design Contradiction:

Ease of manufactureVSReliability

Solution Approach 1:

The patent merges ZPT with DBDCB in a synergistic combination where each ingredient compensates for the other's limitations. This combination maintains formulation simplicity while significantly improving antimicrobial effectiveness, as the two ingredients work together to overcome the high lipophilicity issue that limits ZPT's performance when used alone.

Inventive Principle:

Principle #5Merging (Combining)

Data Source

PatentEP3182825B1Composition comprising 1,2-dibrom-2,4-dicyanobutane (DBDCB) and zinc pyrithione (ZPT)

Publication Date: 2018.04.18 LANXESS DEUTSCHLAND GMBH

AI summary

The invention relates to a composition characterized in that it comprises 1,2-dibromo-2,4-dicyanobutane (DBDCB) and zink pyrithione (ZPT) as active components.