Phthalimido Peroxy Caproic Acid Detergent for Cold Water Bleaching
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Solution Overview
Problem
Conventional laundry detergents exhibit reduced cleaning and bleaching performance at cold wash temperatures and shorter wash cycles, leading to inadequate fabric cleaning and color fidelity.
Innovation Solution
A solid fabric treatment composition comprising phthalimido peroxy caproic acid, low levels of zeolite and phosphate builders, and a bleach catalyst, formulated to maintain a low pH and high reserve alkalinity, which enhances bleaching efficacy and anti-encrustation, even at extremely cold temperatures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If conventional laundry detergents are used at cold wash temperatures, then energy consumption is reduced, but cleaning performance and bleaching performance are reduced
Solution Approach 1:
The patent changes the chemical parameters of the detergent system by using a low pH formulation (pH 6.0-7.5) with phthalimido peroxy caproic acid as the active bleaching agent, combined with specific catalysts (oxaziridinium, transition metals) that are optimized for cold water activation. This parameter change enables effective bleaching at cold temperatures without requiring high thermal energy input
Solution Approach 2:
The patent creates a composite bleaching system combining multiple components: phthalimido peroxy caproic acid as the primary bleaching agent, oxaziridinium-based or transition metal bleach catalysts, low builder levels (zeolite and phosphate), and low pH buffering agents. This composite formulation synergistically enhances cold water bleaching performance while maintaining energy efficiency
2Loss of energy
If conventional laundry detergents are used at cold wash temperatures, then energy consumption is reduced, but bleaching performance is especially reduced
Solution Approach 1:
The patent fundamentally changes the bleaching chemistry parameters by using phthalimido peroxy caproic acid with low pH (6.0-7.5) and specific catalysts that have high activity at cold temperatures. This enables the bleaching reaction to proceed efficiently without thermal activation, directly resolving the contradiction between energy savings and bleaching effectiveness
Solution Approach 2:
The patent introduces oxaziridinium-based bleach catalysts and transition metal catalysts as intermediaries that facilitate the bleaching reaction at cold temperatures. These catalysts act as mediators between the phthalimido peroxy caproic acid and the fabric, enabling effective bleaching without requiring high temperature energy input
3Object-generated harmful factors
If low builder levels are used, then calcium carbonate formation is reduced, but water softening capacity is reduced
Solution Approach 1:
The patent changes the pH parameter to low levels (6.0-7.5) which thermodynamically reduces calcium carbonate precipitation. Combined with low builder formulations, this parameter change shifts the calcium chemistry to prevent encrustation while maintaining adequate water softening through the synergistic action of reduced builder levels and acidic pH conditions
4Object-generated harmful factors
If low pH profile is used, then calcium carbonate formation is reduced, but stability of bleach system may be compromised
Solution Approach 1:
The patent creates a stable low pH bleach system through composite formulation combining phthalimido peroxy caproic acid with oxaziridinium-based catalysts and transition metal catalysts. This composite system maintains stability at low pH (6.0-7.5) because the catalysts are specifically selected for their stability and activity in acidic conditions, preventing decomposition while maintaining bleaching efficacy
Solution Approach 2:
The patent uses phthalimido peroxy caproic acid as a pre-formed, stable peracid that can be stored and handled at low pH without immediate decomposition. This allows the system to maintain low pH for calcium carbonate prevention while the peracid remains stable until activation during the wash cycle
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 excellent bleaching performance and color fidelity at low temperatures, with reduced calcium carbonate formation and improved stability of bleach catalysts, ensuring optimal cleaning and color preservation.
Implementation Method 1
a phthalimido peroxy caproic acid bleaching system at low pH and low builder levels, which provides a fabric treatment composition having an excellent bleaching efficacy
Implementation Method 2
The bleaching performance of this composition is further improved when bleach catalysts are additionally incorporated therein, preferred bleaching catalysts are oxaziridinium-based bleach catalysts, transition metal bleach catalysts and bleaching enzymes
Data Source
AI summary
The present invention relates to a solid fabric treatment detergent composition comprising: (i) detersive surfactant; (ii) phthalimido peroxy caproic acid; (iii) from 0wt% to 10wt% zeolite builder; (iv) from 0wt% to 10w% phosphate builder; and (v) optionally from 0wt% to 10wt% silicate salt, wherein the upon dilution in de-ionized water to a concentration of 1wt% at 20oC, the composition has a pH of from 7.6 to 8.8.