Patent Grant
7892341
The present invention relates to a stain repellent composition.
Stain repellent compositions are well known. Their use can either be temporary or more permanent.
In most cases stain repellent are based upon fluorine containing polymers or silicones, due to their low surface energies. However, this low surface energy (which provides good stain repellence) also provides a disadvantage in that these materials pose adherence issues to the surfaces to which they are applied.
Furthermore the high hydrophobicity of these materials also means that creating a water based application matrix is difficult/impossible.
It is an object of the present invention to obviate/mitigate the problems outlined above.
According to a first aspect of the invention there is provided a stain repellent composition comprising a cellulose based compound which has been modified hydrophobically.
The stain repellents of the invention have been found to have excellent properties. Amongst these advantages are excellent adhesion to substrates and a compatibility with both aqueous and non-aqueous systems.
Preferably the cellulose based compound comprises starch including modified, e.g. cationic starch, alginic acid, cyclodextrin or an admixture thereof.
Preferably the hydrophobic modifying process comprises the grafting of a hydrophobic moiety on the cellulose based compound. Preferred examples of hydrophobic moieties include epoxy functional silicones and fluorinated diols.
It has been found that the stain repellent so the invention typically has a molecular weight of from 3×102 to 3×106 Dalton units.
According to a second aspect of the invention there is provided a method of applying the stain repellents of the first aspect of the invention to a substrate.
It has been found that the binding affinity of the stain repellents of the invention is excellent and to be >0.5 kCal/mol.
Preferably the stain repellent is applied in an automatic washing process (most preferably an automatic laundry washing process). Thus preferably the substrate comprises a fabric material, e.g. such as an item of clothing.
The stain repellent may be applied to other materials in other application processes, e.g. to carpets, glasses, furniture, paper, shoes, vehicle components (e.g. decking, leather, metal/painted metal surfaces).
According to a third aspect of the invention there is provided a textile material treated in accordance with the second aspect of the invention.
The invention will now be illustrated with reference to the following non-limiting Examples.
The following ingredients were added to a 250 mlround bottomed flask:
The flask was heated to 90° C. over 2 hours whilst being purged with argon.
8.26 g of epoxy polydimethyl silicone was added and the mixture was mixed overnight.
The resultant dark tan solids were dried under vacuum.
The procedure of Example 1 was followed with the exception that 3.08 g cyclodextrin was used (instead of the alginic acid) and 10.2 epoxy polydimethyl silicone was added.
The procedure of Example 1 was followed with the exception that 54 g of a Fluorinated Diol (Omnova Lot 2234AM38) was used (instead of the silicone).
The procedure of Example 3 was followed with the exception that 1.5 g of aspartic acid was used (instead of the alginic acid), and 17.05 g of a Fluorinated Diol (Omnova Lot 2234AM38) was used.
The following ingredients were together:
The resultant mixture was a transparent paste.
The procedure of Example 1 was used with the following ingredients:
| Number | Name | Date | Kind |
|---|---|---|---|
| 20090069212 | Burgess et al. | Mar 2009 | A1 |
