Concentrated fabric softener compositions containing biodegradable fabric softeners

A concentrated fabric softening composition selected from the group consisting of:

• I. a solid particulate composition comprising:
• (A) from about 50% to about 95% of biodegradable diester quaternary ammonium fabric softening compound;
• and
• (B) from about 3% to about 30% of viscosity or dispersibility modifier selected from the group consisting of:
• 1. single-long-chain, C.sub.12 -C.sub.22, alkyl, cationic surfactant;
• 2. nonionic surfactant with at least about 8 ethoxy moieties;
• and
• 3. mixtures thereof;
• and
• II. a concentrated liquid composition comprising:
• (A) from about 15% to about 50% of biodegradable diester quaternary ammonium fabric softening compound;
• and
• (B) from about 0.1% to about 30% of viscosity or dispersibility modifier selected from the group consisting of:
• 1. single-long-chain, C.sub.12 -C.sub.22, alkyl, cationic surfactant;
• 2. nonionic surfactant with at least about 10 ethoxy moieties;
• and
• 3. mixtures thereof;
• and
• (C) liquid carrier;
• wherein the biodegradable diester quaternary ammonium fabric softening compound has a formula selected from the group consisting of:
• (I) (R).sub.4-m --N.sup.+ --[(CH.sub.2).sub.n --Y--R.sup.2 ].sub.m X.sup.- (Formula I);
• (II) [R.sup.2 C(O)OCH.sub.2 ][R.sup.2 C(O)O]CHCH.sub.2 N.sup.+ R.sub.3 X.sup.- (Formula II);
• and (III) mixtures thereof
• wherein each Y is --O(O)C--, or --C(O)--O--;
• m is 2 or 3;
• n is 1 to 4;
• each R is a C.sub.1 -C.sub.6 alkyl, hydroxyalkyl group, benzyl group, and mixtures thereof;
• each R.sup.2 is a C.sub.11 -C.sub.22 hydrocarbyl or substituted hydrocarbyl substituent;
• and X.sup.- is any softener-compatible anion;
• wherein more than 50% of said liquid carrier is water;
• wherein said diester quaternary ammonium fabric softening compound is at least about 80% diester;
• wherein the single-long-chain alkyl, cationic surfactant has a single C.sub.12 -C.sub.22 alkyl chain and is selected from the group consisting of quaternary ammonium compounds, non-quaternary amines, alkyl imidazoline, imidazolinum, pyridine and pyridine salts;
• wherein said viscosity or dispersibility modifier affects the composition's viscosity, dispersibility, or both;
• wherein when said diester quaternary ammonium fabric softening compound has Formula (II), said viscosity or dispersibility modifier is single-long-chain, C.sub.12 -C.sub.22, alkyl, catonic surfactant;
• and wherein said composition is essentially free of compositions having the Formula (R).sub.4-m --N.sup.+ [--(CH.sub.2).sub.n --O--C(O)--O--R.sup.2 ].sub.m X.sup.-.